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Consolidated Schedule of Investments (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1] $ 8,235,411    
Net realized gain (loss) (72,214) $ (81,577) $ (46,496)
Investments, at fair value, ending balance 8,769,389 [2] 8,235,411 [1]  
Non-controlled affiliate company investments      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 211,382 [1],[3] 87,084  
Gross additions 107,159 177,905  
Gross reductions (21,734) (37,747)  
Net change in unrealized appreciation (depreciation) (3,044) 4,600  
Net realized gain (loss) 0 (20,460) 320
Investments, at fair value, ending balance 293,763 [2] 211,382 [1],[3] 87,084
Interest, dividend and fee income 11,458 9,448  
Controlled affiliate company investments      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 12,205 [1],[4] 12,790  
Gross additions 490 11,979  
Gross reductions 0 (11,344)  
Net change in unrealized appreciation (depreciation) (833) 10,406  
Net realized gain (loss) 0 (11,626) (927)
Investments, at fair value, ending balance 11,862 [2],[5] 12,205 [1],[4] 12,790
Interest, dividend and fee income 510 439  
Investment, Identifier [Axis]: 3ES Innovation, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[8],[9] 25,451    
Investments, at fair value, ending balance [1],[6],[7],[8],[9]   25,451  
Investment, Identifier [Axis]: 3ES Innovation, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9] 0    
Investments, at fair value, ending balance [1],[6],[8],[9]   0  
Investment, Identifier [Axis]: AAH TOPCO, LLC , One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 8,672    
Investments, at fair value, ending balance [1],[6],[10]   8,672  
Investment, Identifier [Axis]: AAH TOPCO, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 8,604    
Investment, Identifier [Axis]: AAH TOPCO, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 8,152    
Investments, at fair value, ending balance 8,090 [2],[11] 8,152 [1],[6]  
Investment, Identifier [Axis]: AAH TOPCO, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,483    
Investments, at fair value, ending balance 3,477 [2],[11] 1,483 [1],[6]  
Investment, Identifier [Axis]: AAH TOPCO, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: AAH TOPCO, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 778    
Investment, Identifier [Axis]: AAH TOPCO, LLC, Subordinated debt      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 2,566    
Investments, at fair value, ending balance 3,032 [2],[11],[16] 2,566 [1],[6],[15]  
Investment, Identifier [Axis]: ABC Legal Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,323    
Investment, Identifier [Axis]: ABC Legal Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (3)    
Investment, Identifier [Axis]: ABC Legal Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (4)    
Investment, Identifier [Axis]: ACP Ulysses Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[17],[18],[19] 30,144    
Investments, at fair value, ending balance 30,144 [2],[11],[12] 30,144 [1],[7],[17],[18],[19]  
Investment, Identifier [Axis]: ACP Ulysses Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[10] 1,303    
Investments, at fair value, ending balance 1,303 [2],[11],[12] 1,303 [1],[7],[10]  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,300    
Investments, at fair value, ending balance 1,154 [2],[11] 1,300 [1],[6]  
Investment, Identifier [Axis]: AI Titan Parent, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 10,403    
Investments, at fair value, ending balance 10,508 [2],[11] 10,403 [1],[6]  
Investment, Identifier [Axis]: AI Titan Parent, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (11)    
Investments, at fair value, ending balance 0 [2],[11],[14] (11) [1],[6],[13]  
Investment, Identifier [Axis]: AI Titan Parent, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (13)    
Investments, at fair value, ending balance 0 [2],[11],[14] (13) [1],[6],[13]  
Investment, Identifier [Axis]: ALKU Intermediate Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 6,882    
Investments, at fair value, ending balance 6,728 [2],[11] 6,882 [1],[6],[10]  
Investment, Identifier [Axis]: ALKU Intermediate Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 751    
Investments, at fair value, ending balance 727 [2],[11] 751 [1],[6],[10]  
Investment, Identifier [Axis]: AMBA Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 4,468    
Investments, at fair value, ending balance 4,422 [2],[11] 4,468 [1],[6],[18]  
Investment, Identifier [Axis]: AMBA Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,330    
Investments, at fair value, ending balance 1,317 [2],[11] 1,330 [1],[6]  
Investment, Identifier [Axis]: AMBA Buyer, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,122    
Investments, at fair value, ending balance 1,111 [2],[11] 1,122 [1],[6],[10]  
Investment, Identifier [Axis]: AMBA Buyer, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 161 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: AMBA Buyer, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 162    
Investments, at fair value, ending balance 0 [2],[11] 162 [1],[6]  
Investment, Identifier [Axis]: AP Adhesives Holdings, LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: AP Adhesives Holdings, LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: AP Adhesives Holdings, LLC., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 5,800    
Investment, Identifier [Axis]: AVG Intermediate Holdings & AVG Subsidiary Holdings LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 184    
Investments, at fair value, ending balance [1],[6]   184  
Investment, Identifier [Axis]: AVG Intermediate Holdings & AVG Subsidiary Holdings LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 6,419    
Investments, at fair value, ending balance 6,353 [2],[11],[12] 6,419 [1],[6],[17]  
Investment, Identifier [Axis]: AVG Intermediate Holdings & AVG Subsidiary Holdings LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 5,365    
Investments, at fair value, ending balance 5,310 [2],[11] 5,365 [1],[6],[20]  
Investment, Identifier [Axis]: AVG Intermediate Holdings & AVG Subsidiary Holdings LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 837    
Investments, at fair value, ending balance 829 [2],[11] 837 [1],[6]  
Investment, Identifier [Axis]: AVG Intermediate Holdings & AVG Subsidiary Holdings LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 397    
Investments, at fair value, ending balance 393 [2],[11] 397 [1],[6]  
Investment, Identifier [Axis]: AVG Intermediate Holdings & AVG Subsidiary Holdings LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: AVG Intermediate Holdings & AVG Subsidiary Holdings LLC, Subordinated debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 15,672    
Investments, at fair value, ending balance 18,211 [2],[11],[16] 15,672 [1],[6],[15]  
Investment, Identifier [Axis]: AVG Intermediate Holdings & AVG Subsidiary Holdings LLC, Subordinated debt 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 3,400    
Investments, at fair value, ending balance 3,960 [2],[11],[16] 3,400 [1],[6],[15]  
Investment, Identifier [Axis]: AVG Intermediate Holdings & AVG Subsidiary Holdings LLC, Subordinated debt 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,300    
Investments, at fair value, ending balance 1,513 [2],[11],[16] 1,300 [1],[6],[15]  
Investment, Identifier [Axis]: AVG Intermediate Holdings & AVG Subsidiary Holdings LLC, Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 140    
Investment, Identifier [Axis]: Abita Brewing Co. LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 6,000 6,536  
Gross additions 11,690 2,166  
Gross reductions (9,725) (709)  
Net change in unrealized appreciation (depreciation) (2,749) (1,993)  
Net realized gain (loss) 0 0  
Investments, at fair value, ending balance 5,216 6,000 6,536
Interest, dividend and fee income 114 575  
Investment, Identifier [Axis]: Abita Brewing Co., L.L.C., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15],[21] 4,888    
Investments, at fair value, ending balance 2,732 [2],[11],[16],[22],[23] 4,888 [1],[3],[6],[15],[21]  
Investment, Identifier [Axis]: Abita Brewing Co., L.L.C., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15] 677    
Investments, at fair value, ending balance 2,274 [2],[11],[16],[23] 677 [1],[3],[6],[15]  
Investment, Identifier [Axis]: Abita Brewing Co., L.L.C., Second lien      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15],[21] 435    
Investments, at fair value, ending balance 210 [2],[11],[16],[22],[23] 435 [1],[3],[6],[15],[21]  
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[17],[19],[20] 36,885    
Investments, at fair value, ending balance [1],[6],[7],[17],[19],[20]   36,885  
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[20] 9,453    
Investments, at fair value, ending balance [1],[6],[17],[20]   9,453  
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 8,319    
Investments, at fair value, ending balance [1],[6],[18]   8,319  
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[18] 5,223    
Investments, at fair value, ending balance [1],[6],[10],[18]   5,223  
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (13)    
Investments, at fair value, ending balance [1],[6],[13]   (13)  
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (3)    
Investments, at fair value, ending balance [1],[6],[13]   (3)  
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 7,207    
Investments, at fair value, ending balance [1],[6]   7,207  
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (111)    
Investments, at fair value, ending balance [1],[6],[13]   (111)  
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 9,988    
Investments, at fair value, ending balance [1],[6],[24]   9,988  
Investment, Identifier [Axis]: Acquia, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 12,020    
Investments, at fair value, ending balance 12,020 [2],[11],[12] 12,020 [1],[6],[20]  
Investment, Identifier [Axis]: Acquia, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 44    
Investments, at fair value, ending balance 1,083 [2],[11] 44 [1],[6]  
Investment, Identifier [Axis]: Acquia, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,083    
Investments, at fair value, ending balance 112 [2],[11] 1,083 [1],[6]  
Investment, Identifier [Axis]: Active Day, Inc., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,217    
Investments, at fair value, ending balance 2,207 [2],[11] 1,217 [1],[6]  
Investment, Identifier [Axis]: Active Day, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[19] 17,388    
Investments, at fair value, ending balance 17,209 [2],[11],[12] 17,388 [1],[6],[19]  
Investment, Identifier [Axis]: Active Day, Inc., One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 6,594    
Investment, Identifier [Axis]: Active Day, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[19] 1,343    
Investments, at fair value, ending balance 0 [2],[11],[14] 1,343 [1],[6],[19]  
Investment, Identifier [Axis]: Active Day, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[19] 865    
Investments, at fair value, ending balance 1,328 [2],[11] 865 [1],[7],[19]  
Investment, Identifier [Axis]: Active Day, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 689    
Investments, at fair value, ending balance 856 [2],[11] 689 [1],[6]  
Investment, Identifier [Axis]: Active Day, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 608    
Investments, at fair value, ending balance 682 [2],[11] 608 [1],[6]  
Investment, Identifier [Axis]: Active Day, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[19] 597    
Investments, at fair value, ending balance 602 [2],[11] 597 [1],[7],[19]  
Investment, Identifier [Axis]: Active Day, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 592 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Active Day, Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Active Day, Inc., One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4,614    
Investments, at fair value, ending balance 5,684 [2],[11] 4,614 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,919    
Investments, at fair value, ending balance 3,651 [2],[11] 2,919 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 16,177    
Investments, at fair value, ending balance 16,052 [2],[11] 16,177 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 443    
Investments, at fair value, ending balance 440 [2],[11] 443 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 279    
Investments, at fair value, ending balance 307 [2],[11],[16] 279 [1],[6],[15]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 212    
Investments, at fair value, ending balance 210 [2],[11] 212 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 163    
Investments, at fair value, ending balance 162 [2],[11] 163 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 14      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 109    
Investments, at fair value, ending balance 120 [2],[11],[16] 109 [1],[6],[15]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 15      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1    
Investments, at fair value, ending balance 1 [2],[11] 1 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 16      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 14,733    
Investments, at fair value, ending balance 16,980 [2],[11],[16] 14,733 [1],[6],[15]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 3,996    
Investments, at fair value, ending balance 3,964 [2],[11] 3,996 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 3,559    
Investments, at fair value, ending balance 3,531 [2],[11] 3,559 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[19] 3,504    
Investments, at fair value, ending balance 3,513 [2],[11],[12] 3,504 [1],[6],[19]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 3,138    
Investments, at fair value, ending balance 3,114 [2],[11] 3,138 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,006    
Investments, at fair value, ending balance 1,991 [2],[11] 2,006 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,829    
Investments, at fair value, ending balance 1,814 [2],[11] 1,829 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,023    
Investments, at fair value, ending balance 1,015 [2],[11] 1,023 [1],[6]  
Investment, Identifier [Axis]: Acuity Eyecare Holdings, LLC, Senior secured      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 108    
Investments, at fair value, ending balance 107 [2],[11] 108 [1],[6]  
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp., Senior secured      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 535    
Investments, at fair value, ending balance [1],[6]   535  
Investment, Identifier [Axis]: Alera Group, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[20] 35,416    
Investments, at fair value, ending balance [1],[6],[10],[20]   35,416  
Investment, Identifier [Axis]: Alera Group, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 10,065    
Investments, at fair value, ending balance [1],[6],[18]   10,065  
Investment, Identifier [Axis]: Alera Group, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 4,018    
Investments, at fair value, ending balance [1],[6],[18]   4,018  
Investment, Identifier [Axis]: Alera Group, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,080    
Investments, at fair value, ending balance [1],[6]   1,080  
Investment, Identifier [Axis]: Amalthea Parent, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9] 390    
Investments, at fair value, ending balance 472 [2],[11],[25],[26] 390 [1],[6],[9]  
Investment, Identifier [Axis]: Amalthea Parent, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[9],[10],[17],[18],[19],[20] 82,385    
Investments, at fair value, ending balance 84,137 [2],[11],[12],[25],[26] 82,385 [1],[6],[7],[9],[10],[17],[18],[19],[20]  
Investment, Identifier [Axis]: Amalthea Parent, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9] 328    
Investments, at fair value, ending balance 524 [2],[11],[25],[26] 328 [1],[6],[9]  
Investment, Identifier [Axis]: Amberfield Acquisition Co., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 447    
Investments, at fair value, ending balance [1],[6]   447  
Investment, Identifier [Axis]: Amberfield Acquisition Co., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[18] 4,866    
Investments, at fair value, ending balance 7,138 [2],[11],[12] 4,866 [1],[6],[10],[18]  
Investment, Identifier [Axis]: Amberfield Acquisition Co., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 176 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Amberfield Acquisition Co., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 164 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Amberfield Acquisition Co., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 531    
Investment, Identifier [Axis]: Anaplan, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,675    
Investment, Identifier [Axis]: Anaplan, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,492    
Investments, at fair value, ending balance [1],[6]   1,492  
Investment, Identifier [Axis]: Anaplan, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[20] 24,680    
Investments, at fair value, ending balance 58,322 [2],[11] 24,680 [1],[6],[10],[20]  
Investment, Identifier [Axis]: Anaplan, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 13,000    
Investments, at fair value, ending balance 0 [2],[11] 13,000 [1],[6]  
Investment, Identifier [Axis]: Anaplan, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: Any Hour, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 8,975    
Investments, at fair value, ending balance 8,616 [2],[12] 8,975 [1],[6],[17]  
Investment, Identifier [Axis]: Any Hour, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 2,847    
Investments, at fair value, ending balance 3,110 [2],[11],[16] 2,847 [1],[6],[15]  
Investment, Identifier [Axis]: Any Hour, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 294    
Investments, at fair value, ending balance 531 [2],[11] 294 [1],[6]  
Investment, Identifier [Axis]: Any Hour, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 230    
Investments, at fair value, ending balance 148 [2],[11] 230 [1],[6]  
Investment, Identifier [Axis]: Apex Service Partners, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 4,390    
Investments, at fair value, ending balance 13,855 [2],[11] 4,390 [1],[6],[10]  
Investment, Identifier [Axis]: Apex Service Partners, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,406    
Investments, at fair value, ending balance 4,390 [2],[11] 1,406 [1],[6]  
Investment, Identifier [Axis]: Apex Service Partners, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,045    
Investments, at fair value, ending balance 1,045 [2],[11] 1,045 [1],[6]  
Investment, Identifier [Axis]: Apex Service Partners, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 38    
Investments, at fair value, ending balance 0 [2],[11],[14] 38 [1],[6]  
Investment, Identifier [Axis]: Apex Service Partners, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,198    
Investment, Identifier [Axis]: Apex Service Partners, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 3,682    
Investment, Identifier [Axis]: Apothecary Products, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,321    
Investments, at fair value, ending balance 2,191 [2],[12] 2,321 [1],[6]  
Investment, Identifier [Axis]: Apothecary Products, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 65 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Appfire Technologies, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[20] 55,159    
Investments, at fair value, ending balance 56,651 [2],[11],[12] 55,159 [1],[6],[17],[20]  
Investment, Identifier [Axis]: Appfire Technologies, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,603    
Investments, at fair value, ending balance 95 [2],[11] 1,603 [1],[6]  
Investment, Identifier [Axis]: Appfire Technologies, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 203 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Appfire Technologies, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance (266) [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Appriss Health Intermediate Holdings, Inc, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 3,777    
Investments, at fair value, ending balance [1],[6],[24]   3,777  
Investment, Identifier [Axis]: Aras Corporation, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 776    
Investment, Identifier [Axis]: Aras Corporation, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 2,435    
Investment, Identifier [Axis]: Aras Corporation, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 531    
Investments, at fair value, ending balance [1],[6]   531  
Investment, Identifier [Axis]: Aras Corporation, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15],[20] 28,740    
Investments, at fair value, ending balance 28,451 [2],[11] 28,740 [1],[6],[10],[15],[20]  
Investment, Identifier [Axis]: Aras Corporation, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,217    
Investments, at fair value, ending balance 1,565 [2],[11] 1,217 [1],[6]  
Investment, Identifier [Axis]: Aras Corporation, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 2,108    
Investments, at fair value, ending balance [1],[6],[24]   2,108  
Investment, Identifier [Axis]: Arch Global CCT Holdings Corp., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[19] 3,128    
Investments, at fair value, ending balance 3,128 [2],[11],[12] 3,128 [1],[6],[10],[19]  
Investment, Identifier [Axis]: Arch Global CCT Holdings Corp., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 629    
Investments, at fair value, ending balance 629 [2],[11] 629 [1],[6],[10]  
Investment, Identifier [Axis]: Arch Global CCT Holdings Corp., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 585    
Investments, at fair value, ending balance 585 [2],[11] 585 [1],[6]  
Investment, Identifier [Axis]: Arch Global CCT Holdings Corp., Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 93    
Investments, at fair value, ending balance [1],[6]   93  
Investment, Identifier [Axis]: Arctic Wolf Networks, Inc. and Arctic Wolf Networks Canada, Inc., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,818    
Investment, Identifier [Axis]: Arctic Wolf Networks, Inc. and Arctic Wolf Networks Canada, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,262    
Investment, Identifier [Axis]: Arctic Wolf Networks, Inc. and Arctic Wolf Networks Canada, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 8,624    
Investment, Identifier [Axis]: Arctic Wolf Networks, Inc. and Arctic Wolf Networks Canada, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 519    
Investment, Identifier [Axis]: Arctic Wolf Networks, Inc. and Arctic Wolf Networks Canada, Inc., Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 7,470    
Investments, at fair value, ending balance [1],[6]   7,470  
Investment, Identifier [Axis]: Arctic Wolf Networks, Inc. and Arctic Wolf Networks Canada, Inc., Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,959    
Investments, at fair value, ending balance [1],[6]   1,959  
Investment, Identifier [Axis]: Arctic Wolf Networks, Inc. and Arctic Wolf Networks Canada, Inc., Preferred stock 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 449    
Investments, at fair value, ending balance [1],[6]   449  
Investment, Identifier [Axis]: Arctic Wolf Networks, Inc. and Arctic Wolf Networks Canada, Inc., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,393    
Investments, at fair value, ending balance [1],[6]   2,393  
Investment, Identifier [Axis]: Armstrong Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 5,815    
Investments, at fair value, ending balance 5,846 [2],[11],[26],[30],[31] 5,815 [1],[6],[9],[10],[28],[29]  
Investment, Identifier [Axis]: Armstrong Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 3,034    
Investments, at fair value, ending balance 3,049 [2],[11],[26],[30],[31] 3,034 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Arnott, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 314    
Investment, Identifier [Axis]: Arnott, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 4,689    
Investment, Identifier [Axis]: Arnott, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 341    
Investment, Identifier [Axis]: Arrow Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 25,104    
Investments, at fair value, ending balance 24,851 [2],[11] 25,104 [1],[6],[10]  
Investment, Identifier [Axis]: Arrow Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,645    
Investments, at fair value, ending balance 1,629 [2],[11] 1,645 [1],[6]  
Investment, Identifier [Axis]: Arrow Buyer, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 1,577 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Artifact Bidco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,474    
Investments, at fair value, ending balance 1,489 [2],[11] 1,474 [1],[6]  
Investment, Identifier [Axis]: Artifact Bidco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (2)    
Investments, at fair value, ending balance 0 [2],[11],[14] (2) [1],[6],[13]  
Investment, Identifier [Axis]: Artifact Bidco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (1)    
Investments, at fair value, ending balance 0 [2],[11] (1) [1],[6],[13]  
Investment, Identifier [Axis]: Artifact Bidco, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (1)    
Investments, at fair value, ending balance 0 [2],[11],[14] (1) [1],[6],[13]  
Investment, Identifier [Axis]: Aspen Medical Products, LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 111    
Investments, at fair value, ending balance 96 [2],[11] 111 [1],[6]  
Investment, Identifier [Axis]: Aspen Medical Products, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[19] 5,013    
Investments, at fair value, ending balance 7,013 [2],[11],[12] 5,013 [1],[6],[17],[19]  
Investment, Identifier [Axis]: Aspen Medical Products, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 321    
Investments, at fair value, ending balance 455 [2],[11] 321 [1],[6],[10]  
Investment, Identifier [Axis]: Aspen Medical Products, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6]  
Investment, Identifier [Axis]: Aspen Medical Products, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 890    
Investment, Identifier [Axis]: Astute Holdings, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 547    
Investments, at fair value, ending balance 114 [2],[11] 547 [1],[6]  
Investment, Identifier [Axis]: Auvik Networks Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26] 584    
Investment, Identifier [Axis]: Auvik Networks Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26] 66    
Investment, Identifier [Axis]: Auvik Networks Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[25],[26] 1,981    
Investment, Identifier [Axis]: Auvik Networks Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[15],[20] 10,663    
Investments, at fair value, ending balance 11,019 [2],[11],[16],[25],[26] 10,663 [1],[6],[8],[9],[15],[20]  
Investment, Identifier [Axis]: Auvik Networks Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[10],[15] 1,918    
Investments, at fair value, ending balance [1],[6],[8],[9],[10],[15]   1,918  
Investment, Identifier [Axis]: Auvik Networks Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[10],[15] 976    
Investments, at fair value, ending balance 1,009 [2],[11],[16],[25],[26] 976 [1],[6],[8],[9],[10],[15]  
Investment, Identifier [Axis]: Auvik Networks Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9] 0    
Investments, at fair value, ending balance 0 [2],[11],[25],[26] 0 [1],[6],[8],[9]  
Investment, Identifier [Axis]: Auvik Networks Inc., Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9] 504    
Investments, at fair value, ending balance [1],[6],[8],[9]   504  
Investment, Identifier [Axis]: Auvik Networks Inc., Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9] 57    
Investments, at fair value, ending balance [1],[6],[8],[9]   57  
Investment, Identifier [Axis]: Avalara, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 18,170    
Investments, at fair value, ending balance [1],[6],[10]   18,170  
Investment, Identifier [Axis]: Avalara, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: Ave Holdings III, Corp, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 936    
Investments, at fair value, ending balance [1],[6]   936  
Investment, Identifier [Axis]: Ave Holdings III, Corp, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[10] 23,420    
Investments, at fair value, ending balance 22,369 [2],[11],[12] 23,420 [1],[6],[7],[10]  
Investment, Identifier [Axis]: Ave Holdings III, Corp, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 6,108    
Investments, at fair value, ending balance 5,833 [2],[11] 6,108 [1],[6],[18]  
Investment, Identifier [Axis]: Ave Holdings III, Corp, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 802    
Investments, at fair value, ending balance 767 [2],[11] 802 [1],[6]  
Investment, Identifier [Axis]: Ave Holdings III, Corp, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance (10) [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Ave Holdings III, Corp, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 17,541    
Investments, at fair value, ending balance [1],[6],[24]   17,541  
Investment, Identifier [Axis]: Ave Holdings III, Corp, Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 15,226    
Investment, Identifier [Axis]: Ave Holdings III, Corp, Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 157    
Investment, Identifier [Axis]: Axiom Merger Sub Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 6,666    
Investments, at fair value, ending balance [1],[6],[10]   6,666  
Investment, Identifier [Axis]: Axiom Merger Sub Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29] 2,743    
Investments, at fair value, ending balance [1],[6],[9],[29]   2,743  
Investment, Identifier [Axis]: Axiom Merger Sub Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,209    
Investments, at fair value, ending balance [1],[6],[10]   1,209  
Investment, Identifier [Axis]: Axiom Merger Sub Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 174    
Investments, at fair value, ending balance [1],[6]   174  
Investment, Identifier [Axis]: Axiom Merger Sub Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Axiom Merger Sub Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (98)    
Investments, at fair value, ending balance [1],[6],[13]   (98)  
Investment, Identifier [Axis]: Azul Systems, Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[17] 9,492    
Investments, at fair value, ending balance 9,492 [2],[12] 9,492 [1],[17]  
Investment, Identifier [Axis]: Azul Systems, Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 622    
Investments, at fair value, ending balance 973 [2],[11] 622 [1],[6]  
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 428    
Investments, at fair value, ending balance 428 [2],[11] 428 [1],[6],[10]  
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: BECO Holding Company, Inc., Common stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 20,736    
Investment, Identifier [Axis]: BECO Holding Company, Inc., Common stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,116    
Investment, Identifier [Axis]: BECO Holding Company, Inc., LP Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 987    
Investments, at fair value, ending balance [1],[6]   987  
Investment, Identifier [Axis]: BECO Holding Company, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17],[18],[19] 40,999    
Investments, at fair value, ending balance 40,578 [2],[11],[12] 40,999 [1],[6],[10],[17],[18],[19]  
Investment, Identifier [Axis]: BECO Holding Company, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: BECO Holding Company, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 210    
Investment, Identifier [Axis]: BECO Holding Company, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: BECO Holding Company, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 17,976    
Investments, at fair value, ending balance [1],[6],[24]   17,976  
Investment, Identifier [Axis]: BHG Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 24,794    
Investment, Identifier [Axis]: BHG Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: BHG Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: BJH Holdings III Corp., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17],[18] 69,940    
Investments, at fair value, ending balance 69,569 [2],[11],[12] 69,940 [1],[6],[10],[17],[18]  
Investment, Identifier [Axis]: BJH Holdings III Corp., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 666    
Investments, at fair value, ending balance 5,547 [2],[11] 666 [1],[6]  
Investment, Identifier [Axis]: BJH Holdings III Corp., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 576    
Investment, Identifier [Axis]: Baduhenna Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 7,638    
Investments, at fair value, ending balance 7,745 [2],[11],[26],[30] 7,638 [1],[6],[9],[28]  
Investment, Identifier [Axis]: Baduhenna Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 4,550    
Investments, at fair value, ending balance 4,863 [2],[11],[26],[30],[31] 4,550 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Baduhenna Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 1,886    
Investments, at fair value, ending balance 1,912 [2],[11],[26],[30] 1,886 [1],[6],[9],[28]  
Investment, Identifier [Axis]: Baduhenna Bidco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 1,334    
Investments, at fair value, ending balance 1,360 [2],[11],[26],[30],[31] 1,334 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Baduhenna Bidco Limited, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 1,086    
Investments, at fair value, ending balance 1,160 [2],[11],[26],[30],[31] 1,086 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Baduhenna Bidco Limited, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 537    
Investments, at fair value, ending balance 1,205 [2],[11],[26],[30],[31] 537 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 3,301    
Investments, at fair value, ending balance 3,772 [2],[11] 3,301 [1],[6]  
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 5,031 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Bamboo US Bidco LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 2,689    
Investments, at fair value, ending balance 2,713 [2],[11],[12] 2,689 [1],[6],[10],[15]  
Investment, Identifier [Axis]: Bamboo US Bidco LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[15],[29] 1,863    
Investments, at fair value, ending balance 1,981 [2],[11],[31] 1,863 [1],[6],[9],[10],[15],[29]  
Investment, Identifier [Axis]: Bamboo US Bidco LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 197    
Investments, at fair value, ending balance 415 [2],[11] 197 [1],[6],[15]  
Investment, Identifier [Axis]: Bamboo US Bidco LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (4)    
Investments, at fair value, ending balance 1,257 [2],[11] (4) [1],[6],[13]  
Investment, Identifier [Axis]: Bamboo US Bidco LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Bamboo US Bidco LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Banker's Toolbox, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 20,569    
Investments, at fair value, ending balance 20,205 [2],[11],[12] 20,569 [1],[6],[18]  
Investment, Identifier [Axis]: Banker's Toolbox, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance (2) [2],[11],[14] 0 [1],[6]  
Investment, Identifier [Axis]: Barteca Restaurants, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[19] 13,680    
Investments, at fair value, ending balance 13,540 [2],[11],[12] 13,680 [1],[6],[17],[19]  
Investment, Identifier [Axis]: Barteca Restaurants, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 690    
Investments, at fair value, ending balance 683 [2],[11] 690 [1],[6]  
Investment, Identifier [Axis]: Barteca Restaurants, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 471    
Investments, at fair value, ending balance 466 [2],[11] 471 [1],[6]  
Investment, Identifier [Axis]: Barteca Restaurants, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 40    
Investments, at fair value, ending balance 200 [2],[11] 40 [1],[6]  
Investment, Identifier [Axis]: Batteries Plus Holding Corporation, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,239    
Investments, at fair value, ending balance 1,399 [2],[11] 1,239 [1],[6]  
Investment, Identifier [Axis]: Baxter Planning Systems, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 4,060    
Investments, at fair value, ending balance 4,200 [2],[11],[16] 4,060 [1],[6],[10],[15]  
Investment, Identifier [Axis]: Baxter Planning Systems, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Baxter Planning Systems, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Bayou Intermediate II, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: Bayou Intermediate II, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,396    
Investment, Identifier [Axis]: Bayou Intermediate II, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (4)    
Investment, Identifier [Axis]: Bayshore Intermediate #2, L.P., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 6,231    
Investments, at fair value, ending balance [1],[6]   6,231  
Investment, Identifier [Axis]: Bayshore Intermediate #2, L.P., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 7,482    
Investment, Identifier [Axis]: Bayshore Intermediate #2, L.P., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[20] 117,557    
Investments, at fair value, ending balance 95 [2],[11] 117,557 [1],[6],[15],[20]  
Investment, Identifier [Axis]: Bayshore Intermediate #2, L.P., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 124,185 [2],[11],[16] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Bayside Opco, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 29,127 22,044  
Gross additions 1,165 2,758  
Gross reductions (156) (699)  
Net change in unrealized appreciation (depreciation) 3,850 5,024  
Net realized gain (loss) 0 0  
Investments, at fair value, ending balance 33,986 29,127 22,044
Interest, dividend and fee income 3,263 3,660  
Investment, Identifier [Axis]: Bayside Opco, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[32],[33] 6,788    
Investments, at fair value, ending balance [1],[3],[6],[32],[33]   6,788  
Investment, Identifier [Axis]: Bayside Opco, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15] 12,845    
Investments, at fair value, ending balance 12,729 [2],[11],[23] 12,845 [1],[3],[6],[15]  
Investment, Identifier [Axis]: Bayside Opco, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15] 4,499    
Investments, at fair value, ending balance 4,503 [2],[11],[23] 4,499 [1],[3],[6],[15]  
Investment, Identifier [Axis]: Bayside Opco, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6] 0    
Investments, at fair value, ending balance 0 [2],[11],[23] 0 [1],[3],[6]  
Investment, Identifier [Axis]: Bayside Opco, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 10,922    
Investment, Identifier [Axis]: Bayside Opco, LLC, Subordinated debt      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15] 4,995    
Investments, at fair value, ending balance 5,832 [2],[11],[16],[23] 4,995 [1],[3],[6],[15]  
Investment, Identifier [Axis]: Bellwether Buyer, LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 262    
Investment, Identifier [Axis]: Bellwether Buyer, LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 5,031    
Investment, Identifier [Axis]: Bellwether Buyer, LLC., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Belmont Instrument, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[18],[19] 14,504    
Investments, at fair value, ending balance 14,356 [2],[11],[12] 14,504 [1],[7],[18],[19]  
Investment, Identifier [Axis]: Belmont Instrument, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 66    
Investments, at fair value, ending balance 0 [2],[11],[14] 66 [1],[6]  
Investment, Identifier [Axis]: Ben Nevis Midco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28] 561    
Investments, at fair value, ending balance 561 [2],[11],[26],[30] 561 [1],[6],[9],[10],[28]  
Investment, Identifier [Axis]: Ben Nevis Midco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28] 378    
Investments, at fair value, ending balance 378 [2],[11],[26],[30] 378 [1],[6],[9],[10],[28]  
Investment, Identifier [Axis]: Ben Nevis Midco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 60    
Investments, at fair value, ending balance 465 [2],[11],[26],[30] 60 [1],[6],[9],[28]  
Investment, Identifier [Axis]: Ben Nevis Midco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 92    
Investments, at fair value, ending balance 97 [2],[11],[26],[30] 92 [1],[6],[9],[28]  
Investment, Identifier [Axis]: Benefit Plan Administrators of Eau Claire, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[12] 12,973    
Investment, Identifier [Axis]: Benefit Plan Administrators of Eau Claire, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 9,950    
Investment, Identifier [Axis]: Benefit Plan Administrators of Eau Claire, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Benefit Plan Administrators of Eau Claire, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Benetech, Inc.      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 1,793    
Gross additions 0    
Gross reductions (189)    
Net change in unrealized appreciation (depreciation) 485    
Net realized gain (loss) 0    
Investments, at fair value, ending balance 2,089 1,793  
Interest, dividend and fee income 8    
Investment, Identifier [Axis]: Benetech, Inc.      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 1,793 1,353  
Gross additions   780  
Gross reductions   (843)  
Net change in unrealized appreciation (depreciation)   503  
Net realized gain (loss)   0  
Investments, at fair value, ending balance   1,793 1,353
Interest, dividend and fee income   9  
Investment, Identifier [Axis]: Benetech, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15],[21] 1,626    
Investments, at fair value, ending balance 1,997 [2],[11],[16],[22],[23] 1,626 [1],[3],[6],[15],[21]  
Investment, Identifier [Axis]: Benetech, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15],[21] 167    
Investments, at fair value, ending balance 92 [2],[11],[16],[22],[23] 167 [1],[3],[6],[15],[21]  
Investment, Identifier [Axis]: BestPass, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 52,602    
Investments, at fair value, ending balance 52,338 [2],[11],[12] 52,602 [1],[6]  
Investment, Identifier [Axis]: BestPass, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (26)    
Investments, at fair value, ending balance 0 [2],[11],[14] (26) [1],[6],[13]  
Investment, Identifier [Axis]: BestPass, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (35)    
Investments, at fair value, ending balance 0 [2],[11],[14] (35) [1],[6],[13]  
Investment, Identifier [Axis]: Biscuit Parent, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,332    
Investments, at fair value, ending balance 20,004 [2],[11],[12] 1,332 [1],[6],[10]  
Investment, Identifier [Axis]: Biscuit Parent, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Biscuit Parent, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 273    
Investment, Identifier [Axis]: Blackbird Purchaser, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 4,476    
Investments, at fair value, ending balance 4,432 [2],[11] 4,476 [1],[6],[10]  
Investment, Identifier [Axis]: Blackbird Purchaser, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 265    
Investments, at fair value, ending balance 520 [2],[11] 265 [1],[6]  
Investment, Identifier [Axis]: Blackbird Purchaser, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 15    
Investments, at fair value, ending balance 70 [2],[11] 15 [1],[6]  
Investment, Identifier [Axis]: Blades Buyer, Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17],[19] 12,285    
Investments, at fair value, ending balance 12,160 [2],[11],[12] 12,285 [1],[6],[10],[17],[19]  
Investment, Identifier [Axis]: Blades Buyer, Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,743    
Investments, at fair value, ending balance 1,725 [2],[11],[12] 1,743 [1],[6],[10]  
Investment, Identifier [Axis]: Blades Buyer, Inc., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,409    
Investments, at fair value, ending balance 1,395 [2],[11] 1,409 [1],[6],[10]  
Investment, Identifier [Axis]: Blades Buyer, Inc., Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 58    
Investments, at fair value, ending balance 0 [2],[11],[14] 58 [1],[6]  
Investment, Identifier [Axis]: Blades Buyer, Inc., Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 6,897    
Investment, Identifier [Axis]: Blades Buyer, Inc., Senior secured 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,721    
Investment, Identifier [Axis]: Blast Bidco Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 4,905    
Investments, at fair value, ending balance 4,855 [2],[11] 4,905 [1],[6],[10]  
Investment, Identifier [Axis]: Blast Bidco Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Bloomerang, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 4,142    
Investments, at fair value, ending balance 4,142 [2],[11],[16] 4,142 [1],[6],[10]  
Investment, Identifier [Axis]: Bloomerang, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 414 [2],[11],[16] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Bloomerang, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 58 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Blue Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30],[31] 5,340    
Investment, Identifier [Axis]: Blue Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30],[31] 9,268    
Investment, Identifier [Axis]: Blue Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30],[31] 0    
Investment, Identifier [Axis]: Blue Bidco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 1,338    
Investment, Identifier [Axis]: Blue Bidco Limited, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 2,749    
Investment, Identifier [Axis]: Blue River Pet Care, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 856    
Investments, at fair value, ending balance [1],[6]   856  
Investment, Identifier [Axis]: Blue River Pet Care, LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 794    
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[17],[18],[19] 62,942    
Investments, at fair value, ending balance 12 [2],[11] 62,942 [1],[6],[7],[17],[18],[19]  
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 414 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 510    
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 292    
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 297    
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 14      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 256    
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 15      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 225    
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 16      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1    
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 17      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 4    
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 18      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1    
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 12,462    
Investments, at fair value, ending balance 0 [2],[11] 12,462 [1],[6],[10]  
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,905    
Investments, at fair value, ending balance 62,286 [2],[11],[12] 2,905 [1],[6],[10]  
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,793    
Investments, at fair value, ending balance 12,335 [2],[11] 2,793 [1],[6],[10]  
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,765    
Investments, at fair value, ending balance 2,876 [2],[11] 2,765 [1],[6]  
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,125    
Investments, at fair value, ending balance 2,764 [2],[11] 2,125 [1],[6]  
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,258    
Investments, at fair value, ending balance 2,737 [2],[11] 1,258 [1],[6]  
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 417    
Investments, at fair value, ending balance 2,104 [2],[11] 417 [1],[6]  
Investment, Identifier [Axis]: Blue River Pet Care, LLC, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 150    
Investments, at fair value, ending balance 1,246 [2],[11] 150 [1],[6]  
Investment, Identifier [Axis]: BlueMatrix Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 2,540    
Investments, at fair value, ending balance 2,514 [2],[11] 2,540 [1],[6],[17]  
Investment, Identifier [Axis]: BlueMatrix Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 9,925 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: BlueMatrix Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 68 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: BlueMatrix Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 846    
Investment, Identifier [Axis]: BlueMatrix Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 762    
Investment, Identifier [Axis]: Bonterra LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[20] 91,501    
Investments, at fair value, ending balance [1],[6],[10],[20]   91,501  
Investment, Identifier [Axis]: Bonterra LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 7,485    
Investments, at fair value, ending balance [1],[6]   7,485  
Investment, Identifier [Axis]: Bonterra LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 3,778    
Investments, at fair value, ending balance [1],[6],[15]   3,778  
Investment, Identifier [Axis]: Bonterra LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 226    
Investments, at fair value, ending balance [1],[6]   226  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4    
Investments, at fair value, ending balance [1],[6]   4  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 11    
Investments, at fair value, ending balance [1],[6]   11  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, LLC units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 14    
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, LLC units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 11    
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, LLC units 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 4    
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, LLC units 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 66    
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1    
Investments, at fair value, ending balance [1],[6]   1  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 18,823    
Investments, at fair value, ending balance 18,823 [2],[11] 18,823 [1],[6],[20]  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,556    
Investments, at fair value, ending balance 1,556 [2],[11] 1,556 [1],[6],[10]  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 231    
Investments, at fair value, ending balance 231 [2],[11] 231 [1],[6]  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 302    
Investments, at fair value, ending balance 277 [2],[11] 302 [1],[6]  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 15    
Investments, at fair value, ending balance 5 [2],[11] 15 [1],[6]  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, Preferred stock 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 6    
Investments, at fair value, ending balance 4 [2],[11] 6 [1],[6]  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, Preferred stock 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4    
Investments, at fair value, ending balance 1 [2],[11] 4 [1],[6]  
Investment, Identifier [Axis]: Borrower R365 Holdings, LLC, Preferred stock 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 68    
Investments, at fair value, ending balance [1],[6]   68  
Investment, Identifier [Axis]: Bottomline Technologies, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 40,652    
Investments, at fair value, ending balance 0 [2],[11],[14] 40,652 [1],[6],[10]  
Investment, Identifier [Axis]: Bottomline Technologies, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,112    
Investments, at fair value, ending balance 45,696 [2],[11] 5,112 [1],[6],[10]  
Investment, Identifier [Axis]: Bottomline Technologies, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (6)    
Investments, at fair value, ending balance [1],[6],[13]   (6)  
Investment, Identifier [Axis]: BradyIFS Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 4,842    
Investments, at fair value, ending balance [1],[6],[20]   4,842  
Investment, Identifier [Axis]: BradyIFS Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 382    
Investments, at fair value, ending balance [1],[6]   382  
Investment, Identifier [Axis]: BradyIFS Holdings, LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 5,170    
Investment, Identifier [Axis]: BradyIFS Holdings, LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 50    
Investment, Identifier [Axis]: Bullhorn, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[18] 77,997    
Investments, at fair value, ending balance 77,997 [2],[11],[12] 77,997 [1],[6],[17],[18]  
Investment, Identifier [Axis]: Bullhorn, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10],[17] 3,190    
Investments, at fair value, ending balance 3,190 [2],[11],[12] 3,190 [1],[10],[17]  
Investment, Identifier [Axis]: Bullhorn, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 1,643    
Investments, at fair value, ending balance 1,643 [2],[11] 1,643 [1],[6],[18]  
Investment, Identifier [Axis]: Bullhorn, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 736    
Investments, at fair value, ending balance 736 [2],[11] 736 [1],[6],[10]  
Investment, Identifier [Axis]: Bullhorn, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 587    
Investments, at fair value, ending balance 587 [2],[11] 587 [1],[6],[10]  
Investment, Identifier [Axis]: Bullhorn, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 68 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Burning Glass Intermediate Holdings Company, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[19] 12,431    
Investments, at fair value, ending balance 11,232 [2],[12] 12,431 [1],[6],[17],[19]  
Investment, Identifier [Axis]: Burning Glass Intermediate Holdings Company, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 154 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Bynder BidCo, Inc.& Bynder BidCo B.V., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[34] 8,332    
Investments, at fair value, ending balance 8,332 [2],[11],[26],[35] 8,332 [1],[6],[9],[10],[34]  
Investment, Identifier [Axis]: Bynder BidCo, Inc.& Bynder BidCo B.V., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[34] 2,204    
Investments, at fair value, ending balance 2,204 [2],[11],[26],[35] 2,204 [1],[6],[9],[10],[34]  
Investment, Identifier [Axis]: Bynder BidCo, Inc.& Bynder BidCo B.V., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[34] 0    
Investments, at fair value, ending balance 0 [2],[11],[26],[35] 0 [1],[6],[9],[34]  
Investment, Identifier [Axis]: Bynder BidCo, Inc.& Bynder BidCo B.V., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[34] 0    
Investments, at fair value, ending balance 0 [2],[11],[14],[26],[35] 0 [1],[6],[9],[13],[34]  
Investment, Identifier [Axis]: CAP-KSI Holdings, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 167    
Investment, Identifier [Axis]: CAP-KSI Holdings, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: CAP-KSI Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 6,584    
Investments, at fair value, ending balance 13,196 [2],[11],[12] 6,584 [1],[6]  
Investment, Identifier [Axis]: CAP-KSI Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 182    
Investments, at fair value, ending balance 396 [2],[11] 182 [1],[6]  
Investment, Identifier [Axis]: CAP-KSI Holdings, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 645    
Investments, at fair value, ending balance 717 [2],[11] 645 [1],[6]  
Investment, Identifier [Axis]: CB Buyer, Inc., LP Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 258    
Investments, at fair value, ending balance [1],[6]   258  
Investment, Identifier [Axis]: CB Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 46,611    
Investments, at fair value, ending balance 51,465 [2],[11] 46,611 [1],[6]  
Investment, Identifier [Axis]: CB Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: CB Buyer, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 562 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: CB Buyer, Inc.,Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 160    
Investment, Identifier [Axis]: CCSL Holdings, LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9] 680    
Investments, at fair value, ending balance [1],[6],[9]   680  
Investment, Identifier [Axis]: CCSL Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[9],[17],[19] 20,903    
Investments, at fair value, ending balance 20,842 [2],[12] 20,903 [1],[7],[9],[17],[19]  
Investment, Identifier [Axis]: CCSL Holdings, LLC, One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,767    
Investment, Identifier [Axis]: CCSL Holdings, LLC, One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,202    
Investment, Identifier [Axis]: CCSL Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10] 5,642    
Investments, at fair value, ending balance 5,627 [2],[11],[12] 5,642 [1],[6],[9],[10]  
Investment, Identifier [Axis]: CCSL Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[29] 3,552    
Investments, at fair value, ending balance 3,562 [2],[11],[31] 3,552 [1],[6],[9],[10],[29]  
Investment, Identifier [Axis]: CCSL Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9] 3,472    
Investments, at fair value, ending balance 3,462 [2],[11] 3,472 [1],[6],[9]  
Investment, Identifier [Axis]: CCSL Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9] 2,884    
Investments, at fair value, ending balance 2,877 [2],[11],[12] 2,884 [1],[6],[9]  
Investment, Identifier [Axis]: CCSL Holdings, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9] 116    
Investments, at fair value, ending balance 320 [2],[11] 116 [1],[6],[9]  
Investment, Identifier [Axis]: CCSL Holdings, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13] (7)    
Investments, at fair value, ending balance 975 [2],[11] (7) [1],[6],[9],[13]  
Investment, Identifier [Axis]: CCSL Holdings, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[29] (247)    
Investments, at fair value, ending balance 34,411 [2],[11],[31] (247) [1],[6],[9],[13],[29]  
Investment, Identifier [Axis]: CCSL Holdings, LLC, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[29] (48)    
Investments, at fair value, ending balance 6,741 [2],[11],[31] (48) [1],[6],[9],[13],[29]  
Investment, Identifier [Axis]: CCSL Holdings, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 676    
Investment, Identifier [Axis]: CG Group Holdings, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 718    
Investment, Identifier [Axis]: CG Group Holdings, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 645    
Investments, at fair value, ending balance [1],[6]   645  
Investment, Identifier [Axis]: CG Group Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[10],[15],[17],[19] 45,452    
Investments, at fair value, ending balance 46,395 [2],[11],[12],[16] 45,452 [1],[6],[7],[10],[15],[17],[19]  
Investment, Identifier [Axis]: CG Group Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 698    
Investments, at fair value, ending balance 804 [2],[11],[16] 698 [1],[6],[15]  
Investment, Identifier [Axis]: CHA Vision Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,053    
Investment, Identifier [Axis]: CHA Vision Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 343    
Investment, Identifier [Axis]: CHA Vision Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: CHA Vision Holdings, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 304    
Investment, Identifier [Axis]: CHA Vision Holdings, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (3)    
Investment, Identifier [Axis]: CHA Vision Holdings, Inc., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 610    
Investment, Identifier [Axis]: CHHJ Midco, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 419    
Investments, at fair value, ending balance [1],[6],[24]   419  
Investment, Identifier [Axis]: CHHJ Midco, LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 428    
Investment, Identifier [Axis]: CHHJ Midco, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[17],[19] 3,732    
Investments, at fair value, ending balance 3,693 [2],[11],[12] 3,732 [1],[17],[19]  
Investment, Identifier [Axis]: CHHJ Midco, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: CHVAC Services Investment, LLC, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 301    
Investments, at fair value, ending balance [1],[6]   301  
Investment, Identifier [Axis]: CHVAC Services Investment, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 2,945    
Investments, at fair value, ending balance 6,367 [2],[11],[12] 2,945 [1],[6],[17]  
Investment, Identifier [Axis]: CHVAC Services Investment, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,371    
Investments, at fair value, ending balance 1,656 [2],[11],[12] 1,371 [1],[6]  
Investment, Identifier [Axis]: CHVAC Services Investment, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: CHVAC Services Investment, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 61    
Investment, Identifier [Axis]: CHVAC Services Investment, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 453    
Investment, Identifier [Axis]: CI (Quercus) Intermediate Holdings, LLC, LP Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 996    
Investments, at fair value, ending balance [1],[6]   996  
Investment, Identifier [Axis]: CI (Quercus) Intermediate Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17] 27,427    
Investments, at fair value, ending balance [1],[6],[10],[17]   27,427  
Investment, Identifier [Axis]: CI (Quercus) Intermediate Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 53    
Investments, at fair value, ending balance [1],[6]   53  
Investment, Identifier [Axis]: CI (Quercus) Intermediate Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: CI (Quercus) Intermediate Holdings, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 993    
Investment, Identifier [Axis]: CI (Quercus) Intermediate Holdings, LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 32,031    
Investment, Identifier [Axis]: CI (Quercus) Intermediate Holdings, LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 31    
Investment, Identifier [Axis]: CI (Quercus) Intermediate Holdings, LLC., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 66    
Investment, Identifier [Axis]: CI (Quercus) Intermediate Holdings, LLC., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: CMI Parent Inc., Common stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 626    
Investments, at fair value, ending balance 677 [2],[11] 626 [1],[6]  
Investment, Identifier [Axis]: CMI Parent Inc., Common stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 716    
Investments, at fair value, ending balance 1,034 [2],[11] 716 [1],[6]  
Investment, Identifier [Axis]: CMI Parent Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 22,468    
Investments, at fair value, ending balance 22,355 [2],[12] 22,468 [1],[6]  
Investment, Identifier [Axis]: CMI Parent Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[20] 19,789    
Investments, at fair value, ending balance 19,679 [2],[11],[12] 19,789 [1],[6],[17],[20]  
Investment, Identifier [Axis]: CMI Parent Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 8,899    
Investments, at fair value, ending balance 8,852 [2],[11],[12] 8,899 [1],[6],[10]  
Investment, Identifier [Axis]: CMI Parent Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (3)    
Investments, at fair value, ending balance [1],[6],[13]   (3)  
Investment, Identifier [Axis]: CMI Parent Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: CMI Parent Inc., Senior secured      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 9,485    
Investments, at fair value, ending balance 9,435 [2],[11],[12] 9,485 [1],[6],[20]  
Investment, Identifier [Axis]: COP Hometown Acquisitions, Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,400    
Investments, at fair value, ending balance 5,490 [2],[11] 2,400 [1],[6],[10]  
Investment, Identifier [Axis]: COP Hometown Acquisitions, Inc., Senior secured 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 922    
Investments, at fair value, ending balance 688 [2],[11] 922 [1],[6]  
Investment, Identifier [Axis]: COP Hometown Acquisitions, Inc., Senior secured 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: COP Hometown Acquisitions, Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,339    
Investments, at fair value, ending balance 2,376 [2],[11],[12] 2,339 [1],[6],[10]  
Investment, Identifier [Axis]: COP Hometown Acquisitions, Inc., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,533    
Investments, at fair value, ending balance 2,314 [2],[11],[12] 1,533 [1],[6],[10]  
Investment, Identifier [Axis]: COP Hometown Acquisitions, Inc., Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,083    
Investments, at fair value, ending balance 1,517 [2],[11] 1,083 [1],[6],[10]  
Investment, Identifier [Axis]: COP Hometown Acquisitions, Inc., Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,154    
Investments, at fair value, ending balance 1,370 [2],[11] 1,154 [1],[6],[10]  
Investment, Identifier [Axis]: COP Hometown Acquisitions, Inc., Senior secured 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 696    
Investments, at fair value, ending balance 1,142 [2],[11] 696 [1],[6],[10]  
Investment, Identifier [Axis]: COP Hometown Acquisitions, Inc., Senior secured 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 1,072 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: COP Hometown Acquisitions, Inc., Senior secured 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,383    
Investments, at fair value, ending balance 1,037 [2],[11] 1,383 [1],[6]  
Investment, Identifier [Axis]: COP Hometown Acquisitions, Inc., Senior secured 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,045    
Investments, at fair value, ending balance 913 [2],[11] 1,045 [1],[6],[10]  
Investment, Identifier [Axis]: CRH Healthcare Purchaser, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 625    
Investments, at fair value, ending balance [1],[6]   625  
Investment, Identifier [Axis]: CRH Healthcare Purchaser, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 824    
Investment, Identifier [Axis]: CRH Healthcare Purchaser, Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 23,379    
Investments, at fair value, ending balance [1],[6],[10]   23,379  
Investment, Identifier [Axis]: CRH Healthcare Purchaser, Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10],[17] 6,318    
Investments, at fair value, ending balance [1],[10],[17]   6,318  
Investment, Identifier [Axis]: CRH Healthcare Purchaser, Inc., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 5,667    
Investments, at fair value, ending balance [1],[6],[17]   5,667  
Investment, Identifier [Axis]: CRH Healthcare Purchaser, Inc., Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 4,281    
Investments, at fair value, ending balance [1],[6],[10]   4,281  
Investment, Identifier [Axis]: CRH Healthcare Purchaser, Inc., Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 240    
Investments, at fair value, ending balance [1],[6]   240  
Investment, Identifier [Axis]: CST Holding Company, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10],[18] 34,063    
Investments, at fair value, ending balance 33,715 [2],[11] 34,063 [1],[10],[18]  
Investment, Identifier [Axis]: CST Holding Company, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: CVP Holdco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 13,529    
Investments, at fair value, ending balance 13,529 [2],[11] 13,529 [1],[6]  
Investment, Identifier [Axis]: CVP Holdco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 776 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: CVP Holdco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Caerus Midco 3 S.A.R.L., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[36] 29,117    
Investments, at fair value, ending balance 29,110 [2],[11],[12],[26] 29,117 [1],[6],[9],[10],[36]  
Investment, Identifier [Axis]: Caerus Midco 3 S.A.R.L., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[36] 4,827    
Investments, at fair value, ending balance 4,826 [2],[11],[26] 4,827 [1],[6],[9],[10],[36]  
Investment, Identifier [Axis]: Caerus Midco 3 S.A.R.L., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[36] 1,941    
Investments, at fair value, ending balance 4,454 [2],[11],[26] 1,941 [1],[6],[9],[36]  
Investment, Identifier [Axis]: Caerus Midco 3 S.A.R.L., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[36] 308    
Investments, at fair value, ending balance 707 [2],[11],[26] 308 [1],[6],[9],[36]  
Investment, Identifier [Axis]: Caerus Midco 3 S.A.R.L., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[36] 256    
Investments, at fair value, ending balance 262 [2],[11],[26] 256 [1],[6],[9],[36]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc. Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 760    
Investments, at fair value, ending balance [1],[6]   760  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 416    
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[19] 17,827    
Investments, at fair value, ending balance 17,636 [2],[11],[12] 17,827 [1],[6],[7],[19]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 96    
Investments, at fair value, ending balance 95 [2],[11] 96 [1],[6]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 78    
Investments, at fair value, ending balance 77 [2],[11] 78 [1],[6]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 49    
Investments, at fair value, ending balance 49 [2],[11] 49 [1],[6]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (1)    
Investments, at fair value, ending balance 55 [2],[11] (1) [1],[6],[13]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[19] 3,178    
Investments, at fair value, ending balance 3,145 [2],[11],[12] 3,178 [1],[6],[19]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[19] 2,135    
Investments, at fair value, ending balance 2,113 [2],[11],[12] 2,135 [1],[6],[19]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[19] 1,355    
Investments, at fair value, ending balance 1,340 [2],[12] 1,355 [1],[7],[19]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[19] 1,196    
Investments, at fair value, ending balance 1,184 [2],[11],[12] 1,196 [1],[6],[19]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 185    
Investments, at fair value, ending balance 110 [2],[11] 185 [1],[6]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 171    
Investments, at fair value, ending balance 170 [2],[11] 171 [1],[6]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 123    
Investments, at fair value, ending balance 122 [2],[11] 123 [1],[6]  
Investment, Identifier [Axis]: Cafe Rio Holding, Inc., One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 98    
Investments, at fair value, ending balance 97 [2],[11] 98 [1],[6]  
Investment, Identifier [Axis]: Calabrio, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,037    
Investment, Identifier [Axis]: Calabrio, Inc., LP interest 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,135    
Investments, at fair value, ending balance [1],[6]   1,135  
Investment, Identifier [Axis]: Calabrio, Inc., LP interest 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Calabrio, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[20] 74,669    
Investments, at fair value, ending balance 73,921 [2],[11] 74,669 [1],[6],[10],[20]  
Investment, Identifier [Axis]: Calabrio, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,487    
Investments, at fair value, ending balance 5,432 [2],[11] 5,487 [1],[6],[10]  
Investment, Identifier [Axis]: Calabrio, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 202 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Calabrio, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Camelia Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 5,411    
Investments, at fair value, ending balance 5,440 [2],[11],[26],[30],[31] 5,411 [1],[6],[9],[10],[28],[29]  
Investment, Identifier [Axis]: Camelia Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 766    
Investments, at fair value, ending balance 1,065 [2],[11],[26],[30],[31] 766 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Camelia Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 346    
Investments, at fair value, ending balance 331 [2],[11],[26],[30],[31] 346 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Camelia Bidco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[28],[29] 0    
Investments, at fair value, ending balance 0 [2],[11],[14],[26],[30],[31] 0 [1],[6],[9],[13],[28],[29]  
Investment, Identifier [Axis]: Captive Resources Midco, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 15,470    
Investments, at fair value, ending balance 22,958 [2],[11] 15,470 [1],[6],[10],[15]  
Investment, Identifier [Axis]: Captive Resources Midco, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Cavender Stores L.P. Senior Secured      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[17] 5,459    
Investments, at fair value, ending balance [1],[17]   5,459  
Investment, Identifier [Axis]: Cavender Stores L.P., Senior secured      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[12] 5,404    
Investment, Identifier [Axis]: Celerion Buyer, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 3,778    
Investment, Identifier [Axis]: Celerion Buyer, Inc., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 727    
Investment, Identifier [Axis]: Celerion Buyer, Inc., LP units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,302    
Investments, at fair value, ending balance [1],[6]   1,302  
Investment, Identifier [Axis]: Celerion Buyer, Inc., LP units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 982    
Investments, at fair value, ending balance [1],[6]   982  
Investment, Identifier [Axis]: Celerion Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[17],[19] 29,605    
Investments, at fair value, ending balance 30,864 [2],[11],[12] 29,605 [1],[7],[17],[19]  
Investment, Identifier [Axis]: Celerion Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Celerion Buyer, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Celerion Buyer, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[12] 21,901    
Investment, Identifier [Axis]: Centegix Intermediate II, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,353    
Investment, Identifier [Axis]: Centegix Intermediate II, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (1)    
Investment, Identifier [Axis]: Centegix Intermediate II, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: Centegix Intermediate II, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 600    
Investment, Identifier [Axis]: Ceres Groupe SAS & Ceres PikCo, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[37] 16,430    
Investments, at fair value, ending balance 17,481 [2],[11],[26],[31],[38] 16,430 [1],[6],[9],[29],[37]  
Investment, Identifier [Axis]: Ceres Groupe SAS & Ceres PikCo, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[37] 0    
Investments, at fair value, ending balance 2,476 [2],[11],[26],[31],[38] 0 [1],[6],[9],[29],[37]  
Investment, Identifier [Axis]: Ceres Groupe SAS & Ceres PikCo, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[37] 0    
Investments, at fair value, ending balance 0 [2],[11],[26],[31],[38] 0 [1],[6],[9],[29],[37]  
Investment, Identifier [Axis]: Ceres Groupe SAS & Ceres PikCo, Subordinated debt      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[29],[37] 1,916    
Investments, at fair value, ending balance 2,276 [2],[11],[16],[26],[31],[38] 1,916 [1],[6],[9],[15],[29],[37]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[17],[19] 1,730    
Investments, at fair value, ending balance 1,730 [2],[12] 1,730 [1],[17],[19]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 142    
Investments, at fair value, ending balance 260 [2],[11] 142 [1],[6]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 60    
Investments, at fair value, ending balance 142 [2],[11] 60 [1],[6]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 60 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 14      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 15      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,336    
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 16      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,456    
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 17      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 698    
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 18      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 698    
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[17],[19] 1,659    
Investments, at fair value, ending balance 1,659 [2],[12] 1,659 [1],[17],[19]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,197    
Investments, at fair value, ending balance 1,197 [2],[11],[12] 1,197 [1],[6]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[17],[19] 1,182    
Investments, at fair value, ending balance 1,182 [2],[12] 1,182 [1],[17],[19]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 820    
Investments, at fair value, ending balance 820 [2],[11],[12] 820 [1],[6],[17]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[17],[19] 723    
Investments, at fair value, ending balance 723 [2],[12] 723 [1],[17],[19]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 704    
Investments, at fair value, ending balance 704 [2],[11] 704 [1],[6]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 416    
Investments, at fair value, ending balance 416 [2],[11],[12] 416 [1],[6],[17]  
Investment, Identifier [Axis]: Certus Pest, Inc., One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 260    
Investments, at fair value, ending balance 394 [2],[11] 260 [1],[6]  
Investment, Identifier [Axis]: Chase Industries, Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[39] 13,145    
Investments, at fair value, ending balance 13,557 [2],[11],[16],[40] 13,145 [1],[6],[15],[39]  
Investment, Identifier [Axis]: Chase Industries, Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[39] 1,242    
Investments, at fair value, ending balance 1,281 [2],[11],[16],[40] 1,242 [1],[6],[15],[39]  
Investment, Identifier [Axis]: Chase Industries, Inc., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[39] 228    
Investments, at fair value, ending balance 195 [2],[11],[16],[40] 228 [1],[6],[15],[39]  
Investment, Identifier [Axis]: Chase Intermediate, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 351    
Investment, Identifier [Axis]: Chase Intermediate, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17],[18],[19] 49,331    
Investments, at fair value, ending balance 48,826 [2],[11],[12] 49,331 [1],[6],[10],[17],[18],[19]  
Investment, Identifier [Axis]: Chase Intermediate, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 200 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Chase Intermediate, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 938    
Investments, at fair value, ending balance 2,284 [2],[11] 938 [1],[6]  
Investment, Identifier [Axis]: Chase Intermediate, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 598    
Investment, Identifier [Axis]: Chestnut Optical Midco, Inc.      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 93,864    
Gross additions 3,717    
Gross reductions 0    
Net change in unrealized appreciation (depreciation) 4,371    
Net realized gain (loss) 0    
Investments, at fair value, ending balance 101,952 93,864  
Interest, dividend and fee income 3,440    
Investment, Identifier [Axis]: Chestnut Optical Midco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[23] 40,107    
Investment, Identifier [Axis]: Chestnut Optical Midco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[23] (309)    
Investment, Identifier [Axis]: Chestnut Optical Midco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[23] 1,164    
Investment, Identifier [Axis]: Citrin Cooperman Advisors LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 8,058    
Investments, at fair value, ending balance [1],[6]   8,058  
Investment, Identifier [Axis]: Citrin Cooperman Advisors LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 3,498    
Investments, at fair value, ending balance [1],[6],[18]   3,498  
Investment, Identifier [Axis]: Citrin Cooperman Advisors LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,038    
Investments, at fair value, ending balance [1],[6]   1,038  
Investment, Identifier [Axis]: Citrin Cooperman Advisors LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 664    
Investments, at fair value, ending balance [1],[6]   664  
Investment, Identifier [Axis]: Citrin Cooperman Advisors LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 253    
Investments, at fair value, ending balance [1],[6],[10]   253  
Investment, Identifier [Axis]: CivicPlus, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[20] 9,175    
Investments, at fair value, ending balance [1],[6],[15],[20]   9,175  
Investment, Identifier [Axis]: CivicPlus, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 5,430    
Investments, at fair value, ending balance 23,499 [2],[11] 5,430 [1],[6],[10],[15]  
Investment, Identifier [Axis]: CivicPlus, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 4,301    
Investments, at fair value, ending balance 0 [2],[11],[14] 4,301 [1],[6],[10],[15]  
Investment, Identifier [Axis]: CivicPlus, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 552    
Investments, at fair value, ending balance 358 [2],[11],[16] 552 [1],[6],[15]  
Investment, Identifier [Axis]: CivicPlus, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6]  
Investment, Identifier [Axis]: Cloudbees ., Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 797    
Investments, at fair value, ending balance [1],[6]   797  
Investment, Identifier [Axis]: Cloudbees, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,149    
Investment, Identifier [Axis]: Cloudbees, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 821    
Investment, Identifier [Axis]: Cloudbees, Inc., Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,021    
Investments, at fair value, ending balance [1],[6]   2,021  
Investment, Identifier [Axis]: Cloudbees, Inc., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,157    
Investments, at fair value, ending balance 1,120 [2],[11] 1,157 [1],[6]  
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 27    
Investments, at fair value, ending balance [1],[6]   27  
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., LP interest 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 18,854    
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., LP interest 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 100    
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 14,651    
Investments, at fair value, ending balance 14,390 [2],[11],[12] 14,651 [1],[6],[18]  
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4,913    
Investments, at fair value, ending balance 4,817 [2],[11],[12] 4,913 [1],[6]  
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 3,711    
Investments, at fair value, ending balance 3,645 [2],[11] 3,711 [1],[6],[10]  
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 128    
Investments, at fair value, ending balance 417 [2],[11] 128 [1],[6]  
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 6,317    
Investments, at fair value, ending balance 6,206 [2],[11] 6,317 [1],[6]  
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (80)    
Investments, at fair value, ending balance 0 [2],[11],[14] (80) [1],[6],[13]  
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 17,048    
Investments, at fair value, ending balance [1],[6],[24]   17,048  
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 306    
Investments, at fair value, ending balance [1],[6]   306  
Investment, Identifier [Axis]: Cobepa BlueSky Aggregator, SCSp, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 47    
Investment, Identifier [Axis]: Cobepa BlueSky Aggregator, SCSp, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 57    
Investment, Identifier [Axis]: Cobepa BlueSky Aggregator, SCSp, LP Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 670    
Investments, at fair value, ending balance [1],[6]   670  
Investment, Identifier [Axis]: Cobepa BlueSky Aggregator, SCSp, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 41    
Investments, at fair value, ending balance 45 [2],[11],[27] 41 [1],[6]  
Investment, Identifier [Axis]: Cobepa BlueSky Aggregator, SCSp, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 53    
Investments, at fair value, ending balance [1],[6],[24]   53  
Investment, Identifier [Axis]: Collision SP Subco, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 886    
Investments, at fair value, ending balance 2,200 [2],[11] 886 [1],[6],[10]  
Investment, Identifier [Axis]: Collision SP Subco, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 162    
Investments, at fair value, ending balance 1,173 [2],[11] 162 [1],[6]  
Investment, Identifier [Axis]: Collision SP Subco, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 14    
Investments, at fair value, ending balance 45 [2],[11] 14 [1],[6]  
Investment, Identifier [Axis]: Collision SP Subco, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 245    
Investment, Identifier [Axis]: Collision SP Subco, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Color Intermediate, LLC, Senior secured      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 17,565    
Investments, at fair value, ending balance 17,388 [2],[11],[12] 17,565 [1],[6],[10]  
Investment, Identifier [Axis]: Community Care Partners, LLC, One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 3,385    
Investments, at fair value, ending balance 3,454 [2],[11] 3,385 [1],[6],[10]  
Investment, Identifier [Axis]: Connexin Software, Inc., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 301    
Investments, at fair value, ending balance 335 [2],[11] 301 [1],[6]  
Investment, Identifier [Axis]: Connexin Software, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 23    
Investments, at fair value, ending balance [1],[6]   23  
Investment, Identifier [Axis]: Connexin Software, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 11,759    
Investments, at fair value, ending balance 11,759 [2],[11] 11,759 [1],[6],[10]  
Investment, Identifier [Axis]: Connexin Software, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Connexin Software, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 27    
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 38,182    
Investments, at fair value, ending balance [1],[6],[9],[10],[28],[29]   38,182  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 130    
Investments, at fair value, ending balance [1],[6],[9],[28],[29]   130  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 127    
Investments, at fair value, ending balance [1],[6],[9],[28],[29]   127  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 95    
Investments, at fair value, ending balance [1],[6],[9],[28],[29]   95  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 114    
Investments, at fair value, ending balance [1],[6],[9],[28],[29]   114  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 14      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 60    
Investments, at fair value, ending balance [1],[6],[9],[28],[29]   60  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 15      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 140    
Investments, at fair value, ending balance [1],[6],[9],[28]   140  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 16      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 0    
Investments, at fair value, ending balance [1],[6],[9],[28]   0  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 17      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 58    
Investments, at fair value, ending balance [1],[6],[9],[28]   58  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28] 15,686    
Investments, at fair value, ending balance [1],[6],[9],[10],[28]   15,686  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[9],[18],[19],[28] 15,587    
Investments, at fair value, ending balance [1],[9],[18],[19],[28]   15,587  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[9],[17],[19],[28] 2,935    
Investments, at fair value, ending balance [1],[9],[17],[19],[28]   2,935  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[9],[17],[19],[28] 1,951    
Investments, at fair value, ending balance [1],[9],[17],[19],[28]   1,951  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[17],[28] 998    
Investments, at fair value, ending balance [1],[6],[9],[17],[28]   998  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 500    
Investments, at fair value, ending balance [1],[6],[9],[28],[29]   500  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 222    
Investments, at fair value, ending balance [1],[6],[9],[28],[29]   222  
Investment, Identifier [Axis]: Consilio Midco Limited, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 168    
Investments, at fair value, ending balance [1],[6],[9],[28]   168  
Investment, Identifier [Axis]: Consilio Midco Limited, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30],[31] 13,130    
Investment, Identifier [Axis]: Consilio Midco Limited, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 10,689    
Investment, Identifier [Axis]: Consilio Midco Limited, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 6,589    
Investment, Identifier [Axis]: Consilio Midco Limited, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 0    
Investment, Identifier [Axis]: Consilio Midco Limited, Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 0    
Investment, Identifier [Axis]: Consilio Midco Limited, Subordinated debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[30],[31] 1,345    
Investment, Identifier [Axis]: Consilio Midco Limited, Subordinated debt 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[30] 1,681    
Investment, Identifier [Axis]: Consilio Midco Limited, Subordinated debt 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[30] 1    
Investment, Identifier [Axis]: Consor Intermediate II, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 4,050    
Investments, at fair value, ending balance 5,512 [2],[11],[12] 4,050 [1],[6],[17]  
Investment, Identifier [Axis]: Consor Intermediate II, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Consor Intermediate II, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: ContractPod Technologies, Ltd., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[30] 504    
Investment, Identifier [Axis]: ContractPod Technologies, Ltd., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[30] 0    
Investment, Identifier [Axis]: ContractPod Technologies, Ltd., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[30] 0    
Investment, Identifier [Axis]: Corsair Blade IV S.A R.L., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[41] 3,699    
Investment, Identifier [Axis]: Corsair Blade IV S.A R.L., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[31],[41] 1,191    
Investment, Identifier [Axis]: Coupa Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 31,960    
Investments, at fair value, ending balance 31,639 [2],[11] 31,960 [1],[6],[10]  
Investment, Identifier [Axis]: Coupa Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Coupa Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Covercraft Parent III, Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 6,621    
Investments, at fair value, ending balance 5,810 [2],[11] 6,621 [1],[6],[18]  
Investment, Identifier [Axis]: Covercraft Parent III, Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,339    
Investments, at fair value, ending balance 1,176 [2],[11] 1,339 [1],[6]  
Investment, Identifier [Axis]: Covercraft Parent III, Inc., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 54    
Investments, at fair value, ending balance 160 [2],[11] 54 [1],[6]  
Investment, Identifier [Axis]: Creek Parent, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 56,544    
Investment, Identifier [Axis]: Creek Parent, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Creek Parent, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 3,608    
Investment, Identifier [Axis]: Crewline Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,403    
Investments, at fair value, ending balance 10,857 [2],[11] 5,403 [1],[6],[10]  
Investment, Identifier [Axis]: Crewline Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Critical Start, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 175    
Investments, at fair value, ending balance [1],[6]   175  
Investment, Identifier [Axis]: Critical Start, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 158    
Investment, Identifier [Axis]: Critical Start, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 5,201    
Investments, at fair value, ending balance 5,395 [2],[11],[16] 5,201 [1],[6],[10],[15]  
Investment, Identifier [Axis]: Critical Start, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 2,388    
Investments, at fair value, ending balance 2,477 [2],[11],[16] 2,388 [1],[6],[10],[15]  
Investment, Identifier [Axis]: Critical Start, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (2)    
Investments, at fair value, ending balance (2) [2],[11] (2) [1],[6],[13]  
Investment, Identifier [Axis]: Crow River Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 6,032    
Investments, at fair value, ending balance 6,032 [2],[11] 6,032 [1],[6],[10]  
Investment, Identifier [Axis]: Crow River Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 26    
Investments, at fair value, ending balance 0 [2],[11],[14] 26 [1],[6]  
Investment, Identifier [Axis]: Crow River Buyer, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 8,700    
Investment, Identifier [Axis]: Crumbl Enterprises, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 32,326    
Investment, Identifier [Axis]: Crumbl Enterprises, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 421    
Investment, Identifier [Axis]: Crunch Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 56,836    
Investments, at fair value, ending balance 1,765 [2],[11] 56,836 [1],[6]  
Investment, Identifier [Axis]: Crunch Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (39)    
Investments, at fair value, ending balance 0 [2],[11],[14] (39) [1],[6],[13]  
Investment, Identifier [Axis]: Cycle Gear, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 183    
Investments, at fair value, ending balance 356 [2],[11] 183 [1],[6]  
Investment, Identifier [Axis]: Cycle Gear, Inc., One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[19] 45,133    
Investments, at fair value, ending balance 46,304 [2],[11] 45,133 [1],[6],[7],[19]  
Investment, Identifier [Axis]: Cycle Gear, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 150    
Investments, at fair value, ending balance [1],[6]   150  
Investment, Identifier [Axis]: Cycle Gear, Inc., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 160    
Investment, Identifier [Axis]: Cynet Security Ltd., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[42] 1,008    
Investments, at fair value, ending balance 1,172 [2],[11],[26],[43] 1,008 [1],[6],[9],[42]  
Investment, Identifier [Axis]: DCA Investment Holding, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1] 0    
Investments, at fair value, ending balance [1]   0  
Investment, Identifier [Axis]: DCA Investment Holding, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2] 0    
Investment, Identifier [Axis]: DCA Investment Holding, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[24] 783    
Investments, at fair value, ending balance 0 [2],[27] 783 [1],[24]  
Investment, Identifier [Axis]: DCCM, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 593    
Investment, Identifier [Axis]: DCCM, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: DCCM, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: DISA Holdings Corp., One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 691    
Investments, at fair value, ending balance 684 [2],[11] 691 [1],[6]  
Investment, Identifier [Axis]: DISA Holdings Corp., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,242    
Investments, at fair value, ending balance 5,189 [2],[11],[12] 5,242 [1],[6],[10]  
Investment, Identifier [Axis]: DISA Holdings Corp., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 808    
Investments, at fair value, ending balance 800 [2],[11] 808 [1],[6],[10]  
Investment, Identifier [Axis]: DISA Holdings Corp., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 611    
Investments, at fair value, ending balance 605 [2],[11] 611 [1],[6]  
Investment, Identifier [Axis]: DISA Holdings Corp., Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 70    
Investments, at fair value, ending balance 587 [2],[11] 70 [1],[6]  
Investment, Identifier [Axis]: DISA Holdings Corp., Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 34 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: DISA Holdings Corp., Subordinated debt      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 104    
Investments, at fair value, ending balance 106 [2],[11],[16] 104 [1],[6],[15]  
Investment, Identifier [Axis]: DP Flores Holdings, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 137    
Investments, at fair value, ending balance [1],[6]   137  
Investment, Identifier [Axis]: DP Flores Holdings, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 170    
Investment, Identifier [Axis]: Datix Bidco Limited and RL Datix Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 764    
Investments, at fair value, ending balance 771 [2],[11],[26],[30] 764 [1],[6],[9],[28]  
Investment, Identifier [Axis]: Datix Bidco Limited and RL Datix Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 473    
Investments, at fair value, ending balance 481 [2],[11],[26],[30],[31] 473 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Datix Bidco Limited and RL Datix Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[28] (2)    
Investments, at fair value, ending balance 0 [2],[11],[14],[26],[30] (2) [1],[6],[9],[13],[28]  
Investment, Identifier [Axis]: Datix Bidco Limited and RL Datix Holdings, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[28] (1)    
Investments, at fair value, ending balance 0 [2],[11],[14],[26],[30] (1) [1],[6],[9],[13],[28]  
Investment, Identifier [Axis]: Datix Bidco Limited and RL Datix Holdings, Inc., Senior secured      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 0    
Investments, at fair value, ending balance [1],[6],[9],[28]   0  
Investment, Identifier [Axis]: Davidson Hotel Company, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 6,716    
Investments, at fair value, ending balance [1],[6],[18]   6,716  
Investment, Identifier [Axis]: Davidson Hotel Company, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,160    
Investments, at fair value, ending balance [1],[6]   1,160  
Investment, Identifier [Axis]: Davidson Hotel Company, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[20] 39,458    
Investments, at fair value, ending balance 39,052 [2],[12] 39,458 [1],[6],[17],[20]  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 3,328    
Investments, at fair value, ending balance 3,293 [2],[11],[12] 3,328 [1],[6],[18]  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 199    
Investments, at fair value, ending balance 196 [2],[11] 199 [1],[6]  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 64    
Investments, at fair value, ending balance 133 [2],[11] 64 [1],[6]  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Deerfield Dakota Holding, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: Deerfield Dakota Holding, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 1,810    
Investment, Identifier [Axis]: Delinea Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 22,609    
Investments, at fair value, ending balance 22,375 [2],[12] 22,609 [1],[6],[20]  
Investment, Identifier [Axis]: Delinea Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[19],[20] 13,127    
Investments, at fair value, ending balance 12,990 [2],[12] 13,127 [1],[19],[20]  
Investment, Identifier [Axis]: Delinea Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 11,385 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Delinea Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10] 11,500    
Investments, at fair value, ending balance 0 [2],[11],[14] 11,500 [1],[10]  
Investment, Identifier [Axis]: Denali Bidco Limited, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 824    
Investments, at fair value, ending balance [1],[6],[9],[28]   824  
Investment, Identifier [Axis]: Denali Bidco Limited, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 732    
Investment, Identifier [Axis]: Denali Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 7,903    
Investments, at fair value, ending balance 8,492 [2],[11],[26],[30],[31] 7,903 [1],[6],[9],[10],[28],[29]  
Investment, Identifier [Axis]: Denali Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 2,669    
Investments, at fair value, ending balance 99 [2],[11],[16],[26],[30],[31] 2,669 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Denali Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 1,906    
Investments, at fair value, ending balance 6,747 [2],[11],[26],[30],[31] 1,906 [1],[6],[9],[10],[28],[29]  
Investment, Identifier [Axis]: Denali Bidco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 741    
Investments, at fair value, ending balance 150 [2],[11],[16],[26],[30],[31] 741 [1],[6],[9],[10],[28],[29]  
Investment, Identifier [Axis]: Denali Bidco Limited, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[28],[29] 0    
Investments, at fair value, ending balance (4) [2],[11],[14],[26],[30],[31] 0 [1],[6],[9],[13],[28],[29]  
Investment, Identifier [Axis]: Denali Intermediate Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: Denali Intermediate Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,800    
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 44,627    
Investments, at fair value, ending balance 38,258 [2],[12] 44,627 [1],[6],[17]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,254    
Investments, at fair value, ending balance 1,075 [2],[11] 1,254 [1],[6],[10]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,034    
Investments, at fair value, ending balance 887 [2],[11] 1,034 [1],[6],[10]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 469    
Investments, at fair value, ending balance 1,210 [2],[11] 469 [1],[6]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 406    
Investments, at fair value, ending balance 403 [2],[11] 406 [1],[6]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 14      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 394    
Investments, at fair value, ending balance 348 [2],[11] 394 [1],[6]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 15      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 343    
Investments, at fair value, ending balance 294 [2],[11] 343 [1],[6]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 16      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 201    
Investments, at fair value, ending balance 0 [2],[11],[14] 201 [1],[6]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 17      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 200    
Investments, at fair value, ending balance 173 [2],[11] 200 [1],[6]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 18      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 101    
Investments, at fair value, ending balance 87 [2],[11] 101 [1],[6]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 19      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[18] 10,401    
Investments, at fair value, ending balance 8,917 [2],[11] 10,401 [1],[6],[10],[18]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 3,113    
Investments, at fair value, ending balance 2,668 [2],[11] 3,113 [1],[6],[18]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,891    
Investments, at fair value, ending balance 1,621 [2],[11] 1,891 [1],[6],[10]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,797    
Investments, at fair value, ending balance 1,540 [2],[11] 1,797 [1],[6],[10]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,568    
Investments, at fair value, ending balance 1,344 [2],[11] 1,568 [1],[6],[10]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,508    
Investments, at fair value, ending balance 1,293 [2],[11] 1,508 [1],[6],[10]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,292    
Investments, at fair value, ending balance 1,108 [2],[11] 1,292 [1],[6],[10]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,254    
Investments, at fair value, ending balance 1,075 [2],[11] 1,254 [1],[6],[10]  
Investment, Identifier [Axis]: Denali Midco 2, LLC, Second lien      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 11,583    
Investment, Identifier [Axis]: Diamondback Acquisition, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,489    
Investment, Identifier [Axis]: Diamondback Acquisition, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: Diamondback Acquisition, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 38    
Investment, Identifier [Axis]: Diligent Corporation, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 35,506    
Investment, Identifier [Axis]: Diligent Corporation, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 8,985    
Investments, at fair value, ending balance 8,985 [2],[11] 8,985 [1],[6],[10]  
Investment, Identifier [Axis]: Diligent Corporation, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,541    
Investments, at fair value, ending balance 1,541 [2],[11] 1,541 [1],[6]  
Investment, Identifier [Axis]: Diligent Corporation, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Diligent Corporation, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 103 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Diligent Corporation, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,065    
Investment, Identifier [Axis]: Diligent Corporation, Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 31,231    
Investments, at fair value, ending balance [1],[6],[24]   31,231  
Investment, Identifier [Axis]: Diligent Corporation, Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,543    
Investments, at fair value, ending balance [1],[6]   2,543  
Investment, Identifier [Axis]: Disco Parent, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 6,246    
Investments, at fair value, ending balance [1],[6],[10]   6,246  
Investment, Identifier [Axis]: Disco Parent, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: Dollfus Mieg Company, Inc, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28] 925    
Investments, at fair value, ending balance [1],[6],[9],[10],[28]   925  
Investment, Identifier [Axis]: Dollfus Mieg Company, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28] 2,112    
Investments, at fair value, ending balance 1,643 [2],[11],[22],[26],[30] 2,112 [1],[6],[9],[10],[28]  
Investment, Identifier [Axis]: Dollfus Mieg Company, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28] 1,052    
Investments, at fair value, ending balance 819 [2],[11],[22],[26],[30] 1,052 [1],[6],[9],[10],[28]  
Investment, Identifier [Axis]: Dollfus Mieg Company, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[22],[26],[30] 720    
Investment, Identifier [Axis]: Doxa Insurance Holdings LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,739    
Investments, at fair value, ending balance 1,718 [2],[11] 1,739 [1],[6],[10]  
Investment, Identifier [Axis]: Doxa Insurance Holdings LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 1,618 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Doxa Insurance Holdings LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,438    
Investments, at fair value, ending balance 12 [2],[11] 1,438 [1],[6]  
Investment, Identifier [Axis]: Doxa Insurance Holdings LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Dragon UK Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 22,807    
Investments, at fair value, ending balance [1],[6],[9],[10],[28],[29]   22,807  
Investment, Identifier [Axis]: Dragon UK Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 4,447    
Investments, at fair value, ending balance [1],[6],[9],[28],[29]   4,447  
Investment, Identifier [Axis]: Dragon UK Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[28],[29] (19)    
Investments, at fair value, ending balance [1],[6],[9],[13],[28],[29]   (19)  
Investment, Identifier [Axis]: Dwyer Instruments, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,827    
Investments, at fair value, ending balance 52,997 [2],[11],[31] 5,827 [1],[6],[10]  
Investment, Identifier [Axis]: Dwyer Instruments, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 1,485 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Dwyer Instruments, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,477    
Investments, at fair value, ending balance 0 [2],[11],[14],[31] 1,477 [1],[6]  
Investment, Identifier [Axis]: Dwyer Instruments, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 472    
Investments, at fair value, ending balance 0 [2],[11],[14] 472 [1],[6],[10]  
Investment, Identifier [Axis]: Dwyer Instruments, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 5,767 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Dwyer Instruments, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 243    
Investment, Identifier [Axis]: Dwyer Instruments, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,463    
Investment, Identifier [Axis]: Dwyer Instruments, Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 468    
Investment, Identifier [Axis]: Dwyer Instruments, Inc., One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 548    
Investment, Identifier [Axis]: EMS LINQ, LLC, LP Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 748    
Investments, at fair value, ending balance [1],[6]   748  
Investment, Identifier [Axis]: EMS LINQ, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 13,835    
Investments, at fair value, ending balance 13,697 [2],[11] 13,835 [1],[6],[20]  
Investment, Identifier [Axis]: EMS LINQ, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 96    
Investments, at fair value, ending balance 72 [2],[11] 96 [1],[6]  
Investment, Identifier [Axis]: EMS LINQ, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 236    
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[19] 10,981    
Investments, at fair value, ending balance [1],[6],[17],[19]   10,981  
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (1)    
Investments, at fair value, ending balance [1],[6],[13]   (1)  
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (106)    
Investments, at fair value, ending balance [1],[6],[13]   (106)  
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,809    
Investments, at fair value, ending balance [1],[6]   2,809  
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,788    
Investments, at fair value, ending balance [1],[6]   1,788  
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,761    
Investments, at fair value, ending balance [1],[6],[10]   1,761  
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,475    
Investments, at fair value, ending balance [1],[6],[10]   1,475  
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,226    
Investments, at fair value, ending balance [1],[6],[10]   1,226  
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,084    
Investments, at fair value, ending balance [1],[6]   1,084  
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,061    
Investments, at fair value, ending balance [1],[6]   1,061  
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 446    
Investments, at fair value, ending balance [1],[6]   446  
Investment, Identifier [Axis]: ERC Topco Holdings, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 3,870    
Investment, Identifier [Axis]: ERC Topco Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15],[18],[21] 16,178    
Investments, at fair value, ending balance 6,512 [2],[11],[16] 16,178 [1],[6],[10],[15],[18],[21]  
Investment, Identifier [Axis]: ERC Topco Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[21] 112    
Investments, at fair value, ending balance 1,145 [2],[11] 112 [1],[6],[15],[21]  
Investment, Identifier [Axis]: ERC Topco Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15],[18],[21] 275    
Investments, at fair value, ending balance 76 [2],[11],[16] 275 [1],[6],[10],[15],[18],[21]  
Investment, Identifier [Axis]: ERC Topco Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[21] 2    
Investments, at fair value, ending balance [1],[6],[15],[21]   2  
Investment, Identifier [Axis]: ESN Venture Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[17],[18] 5,409    
Investments, at fair value, ending balance 5,353 [2],[11],[12],[16] 5,409 [1],[7],[17],[18]  
Investment, Identifier [Axis]: ESN Venture Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 924    
Investments, at fair value, ending balance 1,585 [2],[11],[16] 924 [1],[6]  
Investment, Identifier [Axis]: ESN Venture Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 817    
Investments, at fair value, ending balance 915 [2],[11],[16] 817 [1],[6]  
Investment, Identifier [Axis]: ESN Venture Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 375    
Investments, at fair value, ending balance 808 [2],[11],[16] 375 [1],[6]  
Investment, Identifier [Axis]: ESN Venture Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 265    
Investments, at fair value, ending balance 437 [2],[11],[16] 265 [1],[6]  
Investment, Identifier [Axis]: ESN Venture Holdings, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 209    
Investments, at fair value, ending balance 771 [2],[11],[16] 209 [1],[6]  
Investment, Identifier [Axis]: ESN Venture Holdings, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 371 [2],[11],[16] 0 [1],[6],[13]  
Investment, Identifier [Axis]: ESN Venture Holdings, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: ESN Venture Holdings, LLC, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 181    
Investment, Identifier [Axis]: ESO Solution, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[20] 11,360    
Investments, at fair value, ending balance 11,359 [2],[11] 11,360 [1],[6],[10],[20]  
Investment, Identifier [Axis]: ESO Solution, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 3,803    
Investments, at fair value, ending balance 3,803 [2],[11] 3,803 [1],[6]  
Investment, Identifier [Axis]: ESO Solution, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 78    
Investments, at fair value, ending balance 142 [2],[11] 78 [1],[6]  
Investment, Identifier [Axis]: EWC Growth Partners LLC, LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: EWC Growth Partners LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 939    
Investments, at fair value, ending balance 946 [2],[11] 939 [1],[6],[10]  
Investment, Identifier [Axis]: EWC Growth Partners LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 1,103    
Investments, at fair value, ending balance 806 [2],[11] 1,103 [1],[6],[18]  
Investment, Identifier [Axis]: EWC Growth Partners LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 36    
Investments, at fair value, ending balance 90 [2],[11] 36 [1],[6]  
Investment, Identifier [Axis]: EWC Growth Partners LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 105    
Investments, at fair value, ending balance 32 [2],[11] 105 [1],[6]  
Investment, Identifier [Axis]: EWC Growth Partners LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Eagle Family Foods Group, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 13,298    
Investments, at fair value, ending balance 12,878 [2],[11] 13,298 [1],[6]  
Investment, Identifier [Axis]: Eagle Family Foods Group, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 186    
Investments, at fair value, ending balance 0 [2],[11],[14] 186 [1],[6]  
Investment, Identifier [Axis]: Eclipse Buyer, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 1,853    
Investment, Identifier [Axis]: Eclipse Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 14,140    
Investments, at fair value, ending balance 14,283 [2],[11] 14,140 [1],[6]  
Investment, Identifier [Axis]: Eclipse Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (18)    
Investments, at fair value, ending balance 0 [2],[11],[14] (18) [1],[6],[13]  
Investment, Identifier [Axis]: Eclipse Buyer, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (12)    
Investments, at fair value, ending balance 0 [2],[11],[14] (12) [1],[6],[13]  
Investment, Identifier [Axis]: Eclipse Buyer, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 1,595    
Investments, at fair value, ending balance [1],[6],[24]   1,595  
Investment, Identifier [Axis]: Einstein Parent, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 9,063    
Investment, Identifier [Axis]: Einstein Parent, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Eliassen Group, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,084    
Investments, at fair value, ending balance 2,084 [2],[11] 2,084 [1],[6],[10]  
Investment, Identifier [Axis]: Eliassen Group, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 140    
Investments, at fair value, ending balance 140 [2],[11] 140 [1],[6]  
Investment, Identifier [Axis]: Elite Dental Partners LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 11,696 13,396  
Gross additions 1,145 5,845  
Gross reductions 0 (3,013)  
Net change in unrealized appreciation (depreciation) (2,149) (4,532)  
Net realized gain (loss) 0 0  
Investments, at fair value, ending balance 10,692 11,696 13,396
Interest, dividend and fee income 223 180  
Investment, Identifier [Axis]: Elite Dental Partners LLC, LLC interest 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[32],[33] 0    
Investments, at fair value, ending balance 0 [2] 0 [1],[3],[32],[33]  
Investment, Identifier [Axis]: Elite Dental Partners LLC, LLC interest 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[32],[33] 0    
Investments, at fair value, ending balance 0 [2] 0 [1],[3],[32],[33]  
Investment, Identifier [Axis]: Elite Dental Partners LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[32],[33] 0    
Investments, at fair value, ending balance [1],[3],[32],[33]   0  
Investment, Identifier [Axis]: Elite Dental Partners LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2] 0    
Investment, Identifier [Axis]: Elite Dental Partners LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15],[21] 5,505    
Investments, at fair value, ending balance 4,414 [2],[11],[16],[22],[23] 5,505 [1],[3],[6],[15],[21]  
Investment, Identifier [Axis]: Elite Dental Partners LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15],[21] 4,393    
Investments, at fair value, ending balance 3,335 [2],[11],[16],[22],[23] 4,393 [1],[3],[6],[15],[21]  
Investment, Identifier [Axis]: Elite Dental Partners LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15] 1,798    
Investments, at fair value, ending balance 1,982 [2],[11],[16],[23] 1,798 [1],[3],[6],[15]  
Investment, Identifier [Axis]: Elite Dental Partners LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[23] 961    
Investment, Identifier [Axis]: Elite Sportswear, L.P., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 9,951    
Investments, at fair value, ending balance 9,478 [2],[11],[16] 9,951 [1],[6],[15]  
Investment, Identifier [Axis]: Elite Sportswear, L.P., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 3,999    
Investments, at fair value, ending balance 3,808 [2],[11],[16] 3,999 [1],[6],[15]  
Investment, Identifier [Axis]: Elite Sportswear, L.P., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 2,058    
Investments, at fair value, ending balance 1,960 [2],[11],[16] 2,058 [1],[6],[15]  
Investment, Identifier [Axis]: Elite Sportswear, L.P., Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[15] 683    
Investments, at fair value, ending balance 651 [2],[11],[16] 683 [1],[6],[7],[15]  
Investment, Identifier [Axis]: Elite Sportswear, L.P., Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 312    
Investments, at fair value, ending balance 298 [2],[11],[16] 312 [1],[6],[15]  
Investment, Identifier [Axis]: Elite Sportswear, L.P., Senior secured 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[15] 298    
Investments, at fair value, ending balance 285 [2],[11],[16] 298 [1],[6],[7],[15]  
Investment, Identifier [Axis]: Elite Sportswear, L.P., Senior secured 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 115    
Investments, at fair value, ending balance 115 [2],[11],[16] 115 [1],[6],[15]  
Investment, Identifier [Axis]: Elite Sportswear, L.P., Senior secured 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 4    
Investments, at fair value, ending balance 4 [2],[11],[16] 4 [1],[6],[15]  
Investment, Identifier [Axis]: Emerge Intermediate, Inc., LLC units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 435    
Investments, at fair value, ending balance 0 [2],[11] 435 [1],[6]  
Investment, Identifier [Axis]: Emerge Intermediate, Inc., LLC units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 108    
Investments, at fair value, ending balance 0 [2],[11] 108 [1],[6]  
Investment, Identifier [Axis]: Emerge Intermediate, Inc., LLC units 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Empyrean Solutions, LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 9,283    
Investment, Identifier [Axis]: Empyrean Solutions, LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Empyrean Solutions, LLC., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Enboarder, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26] 537    
Investment, Identifier [Axis]: Enboarder, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[44] 567    
Investments, at fair value, ending balance [1],[6],[9],[44]   567  
Investment, Identifier [Axis]: Encore Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4,575    
Investments, at fair value, ending balance [1],[6]   4,575  
Investment, Identifier [Axis]: Encore Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 910    
Investments, at fair value, ending balance [1],[6],[10]   910  
Investment, Identifier [Axis]: Encore Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,170    
Investments, at fair value, ending balance [1],[6]   1,170  
Investment, Identifier [Axis]: Encorevet Group LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 100    
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 15,047    
Investments, at fair value, ending balance 15,593 [2],[11] 15,047 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 804    
Investments, at fair value, ending balance 834 [2],[11] 804 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 408    
Investments, at fair value, ending balance 423 [2],[11] 408 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 345    
Investments, at fair value, ending balance 358 [2],[11] 345 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 169    
Investments, at fair value, ending balance 175 [2],[11] 169 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 14      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 162    
Investments, at fair value, ending balance 168 [2],[11] 162 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 15      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 90    
Investments, at fair value, ending balance 157 [2],[11] 90 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 16      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 89    
Investments, at fair value, ending balance 106 [2],[11],[16] 89 [1],[6],[15]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 17      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 5    
Investments, at fair value, ending balance 94 [2],[11] 5 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 7,852    
Investments, at fair value, ending balance 8,137 [2],[11] 7,852 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 4,061    
Investments, at fair value, ending balance 4,209 [2],[11] 4,061 [1],[6],[17]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,065    
Investments, at fair value, ending balance 2,140 [2],[11] 2,065 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 1,823    
Investments, at fair value, ending balance 1,889 [2],[11] 1,823 [1],[6],[17]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 1,135    
Investments, at fair value, ending balance 1,176 [2],[11] 1,135 [1],[6],[17]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 943    
Investments, at fair value, ending balance 977 [2],[11] 943 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 928    
Investments, at fair value, ending balance 962 [2],[11] 928 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 888    
Investments, at fair value, ending balance 921 [2],[11] 888 [1],[6]  
Investment, Identifier [Axis]: Encorevet Group LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 203    
Investments, at fair value, ending balance [1],[6]   203  
Investment, Identifier [Axis]: Energy Worldnet, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 54    
Investment, Identifier [Axis]: Entomo Brands Acquisitions, Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 4,389    
Investments, at fair value, ending balance 4,344 [2],[11] 4,389 [1],[6],[10]  
Investment, Identifier [Axis]: Entomo Brands Acquisitions, Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 30    
Investments, at fair value, ending balance 1,263 [2],[11] 30 [1],[6]  
Investment, Identifier [Axis]: Entomo Brands Acquisitions, Inc., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,263    
Investments, at fair value, ending balance 14 [2],[11] 1,263 [1],[6]  
Investment, Identifier [Axis]: Envernus, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,131    
Investments, at fair value, ending balance 7,993 [2],[11] 5,131 [1],[6],[10]  
Investment, Identifier [Axis]: Envernus, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 5    
Investments, at fair value, ending balance 4 [2],[11] 5 [1],[6]  
Investment, Identifier [Axis]: Envernus, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Equity Methods, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 19,829    
Investment, Identifier [Axis]: Equity Methods, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Equity Methods, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Espresso Bidco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 18,396    
Investment, Identifier [Axis]: Espresso Bidco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Espresso Bidco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Essential Services Holdings Corporation, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 11,399    
Investments, at fair value, ending balance 11,399 [2],[11] 11,399 [1],[6]  
Investment, Identifier [Axis]: Essential Services Holdings Corporation, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (14)    
Investments, at fair value, ending balance 272 [2],[11] (14) [1],[6],[13]  
Investment, Identifier [Axis]: Essential Services Holdings Corporation, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (23)    
Investments, at fair value, ending balance (23) [2],[11],[14] (23) [1],[6],[13]  
Investment, Identifier [Axis]: Evergreen IX Borrower 2023, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 4,869    
Investments, at fair value, ending balance 4,869 [2],[11] 4,869 [1],[6],[10]  
Investment, Identifier [Axis]: Evergreen IX Borrower 2023, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4,438    
Investments, at fair value, ending balance 4,438 [2],[11] 4,438 [1],[6]  
Investment, Identifier [Axis]: Evergreen IX Borrower 2023, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (4)    
Investments, at fair value, ending balance 0 [2],[11],[14] (4) [1],[6],[13]  
Investment, Identifier [Axis]: Excelitas Technologies Corp., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (84)    
Investments, at fair value, ending balance 0 [2],[11],[14] (84) [1],[6],[13]  
Investment, Identifier [Axis]: Excelitas Technologies Corp., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 9,920    
Investments, at fair value, ending balance 10,022 [2],[11] 9,920 [1],[6],[10]  
Investment, Identifier [Axis]: Excelitas Technologies Corp., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[29] 1,901    
Investments, at fair value, ending balance 2,002 [2],[11],[31] 1,901 [1],[6],[9],[10],[29]  
Investment, Identifier [Axis]: Excelitas Technologies Corp., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (4)    
Investments, at fair value, ending balance 0 [2],[11],[14] (4) [1],[6],[13]  
Investment, Identifier [Axis]: Excelitas Technologies Corp., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (3)    
Investments, at fair value, ending balance [1],[6],[13]   (3)  
Investment, Identifier [Axis]: FPG Intermediate Holdco, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 6,637    
Investment, Identifier [Axis]: FPG Intermediate Holdco, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 10,992    
Investments, at fair value, ending balance 1,060 [2],[11] 10,992 [1],[6],[15]  
Investment, Identifier [Axis]: FPG Intermediate Holdco, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 6,084    
Investments, at fair value, ending balance 920 [2],[11],[16] 6,084 [1],[6],[15]  
Investment, Identifier [Axis]: FPG Intermediate Holdco, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 126    
Investments, at fair value, ending balance 130 [2],[11],[16] 126 [1],[6],[15]  
Investment, Identifier [Axis]: FPG Intermediate Holdco, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[22] 1,630    
Investment, Identifier [Axis]: FPG Intermediate Holdco, LLC, Senior secured      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 4,362    
Investment, Identifier [Axis]: FR Vision Holdings, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 471    
Investments, at fair value, ending balance [1],[6]   471  
Investment, Identifier [Axis]: FR Vision Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,070    
Investments, at fair value, ending balance [1],[6],[10]   1,070  
Investment, Identifier [Axis]: FR Vision Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 90    
Investments, at fair value, ending balance [1],[6]   90  
Investment, Identifier [Axis]: FR Vision Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: FSS Buyer LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 7,666    
Investments, at fair value, ending balance 6,880 [2],[11],[12] 7,666 [1],[6],[18]  
Investment, Identifier [Axis]: FSS Buyer LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: FYI Optical Acquisitions, Inc. & FYI USA, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[10],[29] 11,272    
Investments, at fair value, ending balance 10,951 [2],[11],[25],[26],[31] 11,272 [1],[6],[8],[9],[10],[29]  
Investment, Identifier [Axis]: FYI Optical Acquisitions, Inc. & FYI USA, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 4,074    
Investments, at fair value, ending balance 3,958 [2],[11],[25],[26],[31] 4,074 [1],[6],[8],[9],[29]  
Investment, Identifier [Axis]: FYI Optical Acquisitions, Inc. & FYI USA, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 2,774    
Investments, at fair value, ending balance 2,696 [2],[11],[25],[26],[31] 2,774 [1],[6],[8],[9],[29]  
Investment, Identifier [Axis]: FYI Optical Acquisitions, Inc. & FYI USA, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 2,642    
Investments, at fair value, ending balance 2,566 [2],[11],[25],[26],[31] 2,642 [1],[6],[8],[9],[29]  
Investment, Identifier [Axis]: FYI Optical Acquisitions, Inc. & FYI USA, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[20] 1,105    
Investments, at fair value, ending balance 1,105 [2],[11],[25],[26] 1,105 [1],[6],[8],[9],[20]  
Investment, Identifier [Axis]: FYI Optical Acquisitions, Inc. & FYI USA, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[10] 554    
Investments, at fair value, ending balance 554 [2],[11],[25],[26] 554 [1],[6],[8],[9],[10]  
Investment, Identifier [Axis]: FYI Optical Acquisitions, Inc. & FYI USA, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 481    
Investments, at fair value, ending balance 468 [2],[11],[25],[26],[31] 481 [1],[6],[8],[9],[29]  
Investment, Identifier [Axis]: Filevine, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 373    
Investment, Identifier [Axis]: Filevine, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 6,388    
Investment, Identifier [Axis]: Filevine, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 843    
Investment, Identifier [Axis]: Filevine, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[20] 8,344    
Investments, at fair value, ending balance [1],[6],[15],[20]   8,344  
Investment, Identifier [Axis]: Filevine, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Filevine, Inc., Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 3,992    
Investments, at fair value, ending balance [1],[6]   3,992  
Investment, Identifier [Axis]: Filevine, Inc., Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 234    
Investments, at fair value, ending balance [1],[6]   234  
Investment, Identifier [Axis]: Filevine, Inc., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 485    
Investments, at fair value, ending balance [1],[6]   485  
Investment, Identifier [Axis]: Financial Information Technologies, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17],[18] 34,626    
Investments, at fair value, ending balance [1],[6],[10],[17],[18]   34,626  
Investment, Identifier [Axis]: Financial Information Technologies, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 19,894    
Investments, at fair value, ending balance [1],[6],[15]   19,894  
Investment, Identifier [Axis]: Financial Information Technologies, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: Financial Information Technologies, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,221    
Investments, at fair value, ending balance [1],[6],[10]   2,221  
Investment, Identifier [Axis]: Financial Information Technologies, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: Financial Information Technologies, LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 34,280    
Investment, Identifier [Axis]: Financial Information Technologies, LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,687    
Investment, Identifier [Axis]: Financial Information Technologies, LLC., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Financial Information Technologies, LLC., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,199    
Investment, Identifier [Axis]: Financial Information Technologies, LLC., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Finastra USA, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,393    
Investments, at fair value, ending balance 1,490 [2],[11],[26],[30] 5,393 [1],[6],[10]  
Investment, Identifier [Axis]: Finastra USA, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 46    
Investments, at fair value, ending balance [1],[6]   46  
Investment, Identifier [Axis]: FirstUp, Inc. Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 346    
Investments, at fair value, ending balance [1],[6]   346  
Investment, Identifier [Axis]: FirstUp, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 242    
Investment, Identifier [Axis]: FirstUp, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 30    
Investment, Identifier [Axis]: FirstUp, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[20] 12,863    
Investments, at fair value, ending balance 12,994 [2],[11] 12,863 [1],[6],[15],[20]  
Investment, Identifier [Axis]: FirstUp, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 1,226    
Investments, at fair value, ending balance 1,239 [2],[11] 1,226 [1],[6],[10],[15]  
Investment, Identifier [Axis]: FirstUp, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (4)    
Investments, at fair value, ending balance (2) [2],[11],[14] (4) [1],[6],[13]  
Investment, Identifier [Axis]: Flash Topco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[18] 16,240    
Investments, at fair value, ending balance 16,750 [2],[11] 16,240 [1],[7],[18]  
Investment, Identifier [Axis]: Flash Topco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 136    
Investments, at fair value, ending balance 3,344 [2],[11] 136 [1],[6]  
Investment, Identifier [Axis]: Flash Topco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 74    
Investments, at fair value, ending balance 128 [2],[11] 74 [1],[6]  
Investment, Identifier [Axis]: Fleet Farm Group LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 0    
Gross additions 32,523    
Gross reductions 0    
Net change in unrealized appreciation (depreciation) 720    
Net realized gain (loss) 0    
Investments, at fair value, ending balance 33,243 0  
Interest, dividend and fee income 416    
Investment, Identifier [Axis]: Fleet Farm Group, LLC, One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[23] 3,180    
Investment, Identifier [Axis]: Fleet Farm Group, LLC, Senior secured      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[23] 5,242    
Investment, Identifier [Axis]: Flexera Software, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Flexera Software, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,397    
Investment, Identifier [Axis]: Flexera Software, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[31] 495    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[17],[18],[19],[20] 50,501    
Investments, at fair value, ending balance 1,695 [2],[11] 50,501 [1],[6],[7],[17],[18],[19],[20]  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 70    
Investments, at fair value, ending balance 140 [2],[11] 70 [1],[6]  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 138    
Investments, at fair value, ending balance 152 [2],[11] 138 [1],[6]  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 152    
Investments, at fair value, ending balance [1],[6]   152  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC^, One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 51,594    
Investment, Identifier [Axis]: Franchise Brands plc, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[24],[28],[29],[45] 118    
Investments, at fair value, ending balance [1],[6],[9],[24],[28],[29],[45]   118  
Investment, Identifier [Axis]: Freddy's Frozen Custard LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 648    
Investments, at fair value, ending balance [1],[6]   648  
Investment, Identifier [Axis]: Freddy's Frozen Custard LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,397    
Investments, at fair value, ending balance [1],[6],[10]   1,397  
Investment, Identifier [Axis]: Freddy's Frozen Custard LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 10    
Investments, at fair value, ending balance [1],[6]   10  
Investment, Identifier [Axis]: G & H Wire Company, Inc      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 0    
Gross additions 6,657    
Gross reductions 0    
Net change in unrealized appreciation (depreciation) (587)    
Net realized gain (loss) 0    
Investments, at fair value, ending balance 6,070 0  
Interest, dividend and fee income 251    
Investment, Identifier [Axis]: G & H Wire Company, Inc., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: G & H Wire Company, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[21] 6,564    
Investments, at fair value, ending balance 2,847 [2],[11],[16],[23] 6,564 [1],[6],[15],[21]  
Investment, Identifier [Axis]: G & H Wire Company, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[21] 34    
Investments, at fair value, ending balance 0 [2],[11],[23] 34 [1],[6],[15],[21]  
Investment, Identifier [Axis]: GFP Atlantic Holdco 2, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,078    
Investments, at fair value, ending balance 1,067 [2],[11] 1,078 [1],[6],[10]  
Investment, Identifier [Axis]: GFP Atlantic Holdco 2, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 798 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: GHX Ultimate Parent Corporation, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 53,749    
Investment, Identifier [Axis]: GHX Ultimate Parent Corporation, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 952    
Investments, at fair value, ending balance 52,892 [2],[11],[27] 952 [1],[6]  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17],[18],[20] 121,514    
Investments, at fair value, ending balance 120,850 [2],[11],[12] 121,514 [1],[6],[10],[17],[18],[20]  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 65    
Investments, at fair value, ending balance 121 [2],[11] 65 [1],[6]  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (3)    
Investments, at fair value, ending balance 177 [2],[11] (3) [1],[6],[13]  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 341    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 46,202    
Investments, at fair value, ending balance 6,572 [2],[11],[27] 46,202 [1],[6],[24]  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 5,741    
Investments, at fair value, ending balance 138 [2],[11],[27] 5,741 [1],[6],[24]  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., Preferred stock 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 120    
Investments, at fair value, ending balance [1],[6],[24]   120  
Investment, Identifier [Axis]: GTIV, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 72,000    
Investments, at fair value, ending balance 71,983 [2],[11],[12] 72,000 [1],[6]  
Investment, Identifier [Axis]: GTIV, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (3)    
Investments, at fair value, ending balance 0 [2],[11],[14] (3) [1],[6],[13]  
Investment, Identifier [Axis]: GTY Technology Holdings, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 165    
Investment, Identifier [Axis]: GTY Technology Holdings, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 140    
Investments, at fair value, ending balance [1],[6]   140  
Investment, Identifier [Axis]: GTY Technology Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 5,049    
Investments, at fair value, ending balance 9,064 [2],[11],[16] 5,049 [1],[6],[10],[15]  
Investment, Identifier [Axis]: GTY Technology Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 3,296    
Investments, at fair value, ending balance 5,320 [2],[11],[16] 3,296 [1],[6],[10],[15]  
Investment, Identifier [Axis]: GTY Technology Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 605    
Investments, at fair value, ending balance 3,478 [2],[11],[16] 605 [1],[6],[15]  
Investment, Identifier [Axis]: GTY Technology Holdings, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 424    
Investments, at fair value, ending balance 1,038 [2],[11],[16] 424 [1],[6],[15]  
Investment, Identifier [Axis]: GTY Technology Holdings, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (2)    
Investments, at fair value, ending balance 636 [2],[11],[16] (2) [1],[6],[13]  
Investment, Identifier [Axis]: GTY Technology Holdings, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 443 [2],[11],[16] 0 [1],[6],[13]  
Investment, Identifier [Axis]: GTY Technology Holdings, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 324    
Investment, Identifier [Axis]: Gainsight, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[20] 17,981    
Investments, at fair value, ending balance 14,171 [2],[11] 17,981 [1],[6],[15],[20]  
Investment, Identifier [Axis]: Gainsight, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 128    
Investments, at fair value, ending balance 0 [2],[11],[14] 128 [1],[6],[15]  
Investment, Identifier [Axis]: Georgica Pine Clothiers, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2    
Investments, at fair value, ending balance 2 [2],[11] 2 [1],[6]  
Investment, Identifier [Axis]: Georgica Pine Clothiers, LLC, LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 369    
Investments, at fair value, ending balance 292 [2],[11],[27] 369 [1],[6],[24]  
Investment, Identifier [Axis]: Georgica Pine Clothiers, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 9,235    
Investments, at fair value, ending balance 9,127 [2],[11] 9,235 [1],[6]  
Investment, Identifier [Axis]: Georgica Pine Clothiers, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 6,391    
Investments, at fair value, ending balance 6,325 [2],[11] 6,391 [1],[6]  
Investment, Identifier [Axis]: Georgica Pine Clothiers, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 989    
Investments, at fair value, ending balance 979 [2],[11] 989 [1],[6]  
Investment, Identifier [Axis]: Georgica Pine Clothiers, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 889    
Investments, at fair value, ending balance 880 [2],[11] 889 [1],[6]  
Investment, Identifier [Axis]: Georgica Pine Clothiers, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 623    
Investments, at fair value, ending balance 617 [2],[11] 623 [1],[6]  
Investment, Identifier [Axis]: Georgica Pine Clothiers, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2    
Investments, at fair value, ending balance 2 [2],[11] 2 [1],[6]  
Investment, Identifier [Axis]: Gimlet Bidco GMBH, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[46] 1,079    
Investments, at fair value, ending balance 1,137 [2],[11],[26],[31],[47] 1,079 [1],[6],[9],[29],[46]  
Investment, Identifier [Axis]: Gimlet Bidco GMBH, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[46] 76    
Investments, at fair value, ending balance 404 [2],[11],[26],[31],[47] 76 [1],[6],[9],[29],[46]  
Investment, Identifier [Axis]: Gimlet Bidco GMBH, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[31],[47] (10)    
Investment, Identifier [Axis]: Go Car Wash Parent, Corp., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 19    
Investments, at fair value, ending balance 3,678 [2],[11],[27] 19 [1],[6]  
Investment, Identifier [Axis]: Go Car Wash Parent, Corp., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 3,136    
Investments, at fair value, ending balance 0 [2],[11] 3,136 [1],[6],[24]  
Investment, Identifier [Axis]: Goldcup 31018 AB, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[15],[29],[48] 14,283    
Investments, at fair value, ending balance 14,936 [2],[11],[16],[26],[31],[49] 14,283 [1],[6],[9],[10],[15],[29],[48]  
Investment, Identifier [Axis]: Goldcup 31018 AB, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[29],[48] 1,332    
Investments, at fair value, ending balance 1,393 [2],[11],[16],[26],[31],[49] 1,332 [1],[6],[9],[15],[29],[48]  
Investment, Identifier [Axis]: Goldcup 31018 AB, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[29],[48] 0    
Investments, at fair value, ending balance 220 [2],[11],[26],[31],[49] 0 [1],[6],[9],[13],[29],[48]  
Investment, Identifier [Axis]: Graphpad Software, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 8,869    
Investments, at fair value, ending balance [1],[6]   8,869  
Investment, Identifier [Axis]: Graphpad Software, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: Graphpad Software, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 222    
Investments, at fair value, ending balance [1],[6]   222  
Investment, Identifier [Axis]: Gurobi Optimization, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 709    
Investments, at fair value, ending balance [1],[6]   709  
Investment, Identifier [Axis]: Gurobi Optimization, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 775    
Investment, Identifier [Axis]: Gurobi Optimization, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 52,235    
Investments, at fair value, ending balance 49,465 [2],[11] 52,235 [1],[6]  
Investment, Identifier [Axis]: Gurobi Optimization, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (44)    
Investments, at fair value, ending balance 0 [2],[11],[14] (44) [1],[6],[13]  
Investment, Identifier [Axis]: HP TLE Buyer, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 450    
Investment, Identifier [Axis]: HP TLE Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,631    
Investment, Identifier [Axis]: HP TLE Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: HS Spa Holdings, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 730    
Investments, at fair value, ending balance [1],[6]   730  
Investment, Identifier [Axis]: HS Spa Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 11,550    
Investments, at fair value, ending balance 11,432 [2],[11] 11,550 [1],[6],[10]  
Investment, Identifier [Axis]: HS Spa Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 64    
Investments, at fair value, ending balance 685 [2],[11] 64 [1],[6]  
Investment, Identifier [Axis]: HS Spa Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 44 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: HS Spa Holdings, Inc., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 587    
Investment, Identifier [Axis]: HSI Halo Acquisition, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 58    
Investments, at fair value, ending balance [1],[6]   58  
Investment, Identifier [Axis]: HSI Halo Acquisition, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 233    
Investments, at fair value, ending balance [1],[6],[24]   233  
Investment, Identifier [Axis]: HSI Halo Acquisition, Inc., Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 258    
Investment, Identifier [Axis]: HSI Halo Acquisition, Inc., Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 156    
Investment, Identifier [Axis]: Harri US LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 610    
Investment, Identifier [Axis]: Harri US LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 711    
Investments, at fair value, ending balance 137 [2],[11] 711 [1],[6]  
Investment, Identifier [Axis]: Harri US LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 204    
Investment, Identifier [Axis]: Harri US LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 731    
Investment, Identifier [Axis]: Harri US LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[20] 1,211    
Investments, at fair value, ending balance 1,253 [2],[11],[16] 1,211 [1],[6],[15],[20]  
Investment, Identifier [Axis]: Harri US LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 821    
Investments, at fair value, ending balance 847 [2],[11],[16] 821 [1],[6],[15]  
Investment, Identifier [Axis]: Harri US LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 797    
Investments, at fair value, ending balance 822 [2],[11],[16] 797 [1],[6],[15]  
Investment, Identifier [Axis]: Harri US LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (2)    
Investments, at fair value, ending balance (2) [2],[11],[14] (2) [1],[6],[13]  
Investment, Identifier [Axis]: Harri US LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (41)    
Investments, at fair value, ending balance 1,537 [2],[11],[16] (41) [1],[6],[13]  
Investment, Identifier [Axis]: Harri US LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (83)    
Investment, Identifier [Axis]: Harri US LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,407    
Investment, Identifier [Axis]: Harri US LLC, Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 587    
Investments, at fair value, ending balance [1],[6]   587  
Investment, Identifier [Axis]: Harri US LLC, Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,342    
Investments, at fair value, ending balance [1],[6]   1,342  
Investment, Identifier [Axis]: Harri US LLC, Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Harri US LLC, Warrant 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 196    
Investments, at fair value, ending balance [1],[6]   196  
Investment, Identifier [Axis]: Harri US LLC, Warrant 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 132    
Investments, at fair value, ending balance [1],[6]   132  
Investment, Identifier [Axis]: Harri US LLC^, Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 123    
Investment, Identifier [Axis]: Health Buyer, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 3,853    
Investments, at fair value, ending balance 3,863 [2],[11],[12] 3,853 [1],[6],[10]  
Investment, Identifier [Axis]: Health Buyer, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,776    
Investments, at fair value, ending balance 1,763 [2],[11] 1,776 [1],[6],[10]  
Investment, Identifier [Axis]: Health Buyer, LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 714    
Investments, at fair value, ending balance 886 [2],[11] 714 [1],[6]  
Investment, Identifier [Axis]: Health Buyer, LLC, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 129 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Health Buyer, LLC, Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: HealthEdge Software, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 19,218    
Investments, at fair value, ending balance [1],[6]   19,218  
Investment, Identifier [Axis]: HealthEdge Software, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (26)    
Investments, at fair value, ending balance [1],[6],[13]   (26)  
Investment, Identifier [Axis]: HealthEdge Software, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (43)    
Investments, at fair value, ending balance [1],[6],[13]   (43)  
Investment, Identifier [Axis]: Healthmark Holdings, L.P., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: Healthmark Holdings, L.P., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: Healthmark Holdings, L.P., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,484    
Investment, Identifier [Axis]: Heartland Veterinary Partners LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,507    
Investments, at fair value, ending balance 2,506 [2],[11] 2,507 [1],[6],[10]  
Investment, Identifier [Axis]: Heartland Veterinary Partners LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,190    
Investments, at fair value, ending balance 1,190 [2],[11] 1,190 [1],[6],[10]  
Investment, Identifier [Axis]: Heartland Veterinary Partners LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 8,093    
Investments, at fair value, ending balance 8,011 [2],[11],[12] 8,093 [1],[6],[10]  
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 220    
Investments, at fair value, ending balance 720 [2],[11] 220 [1],[6]  
Investment, Identifier [Axis]: High Bar Brands Operating, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,435    
Investments, at fair value, ending balance 1,422 [2],[11] 1,435 [1],[6],[10]  
Investment, Identifier [Axis]: High Bar Brands Operating, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 299    
Investments, at fair value, ending balance 296 [2],[11] 299 [1],[6],[10]  
Investment, Identifier [Axis]: High Bar Brands Operating, LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 254    
Investments, at fair value, ending balance 250 [2],[11] 254 [1],[6]  
Investment, Identifier [Axis]: High Bar Brands Operating, LLC, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 4 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Hopdoddy Holdings, LLC, LLC units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 217    
Investments, at fair value, ending balance 271 [2],[11] 217 [1],[6]  
Investment, Identifier [Axis]: Hopdoddy Holdings, LLC, LLC units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 48    
Investments, at fair value, ending balance 60 [2],[11] 48 [1],[6]  
Investment, Identifier [Axis]: Hornet Security Holding GMBH, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[15],[29],[46] 748    
Investments, at fair value, ending balance 796 [2],[11],[26],[31],[47] 748 [1],[6],[9],[10],[15],[29],[46]  
Investment, Identifier [Axis]: Hornet Security Holding GMBH, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[15],[29],[46] 498    
Investments, at fair value, ending balance 530 [2],[11],[26],[31],[47] 498 [1],[6],[9],[10],[15],[29],[46]  
Investment, Identifier [Axis]: Hornet Security Holding GMBH, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[29],[46] 0    
Investments, at fair value, ending balance 15 [2],[11],[26],[31],[47] 0 [1],[6],[9],[13],[29],[46]  
Investment, Identifier [Axis]: Hornet Security Holding GMBH, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[29],[46] 0    
Investments, at fair value, ending balance 112 [2],[11],[26],[31],[47] 0 [1],[6],[9],[13],[29],[46]  
Investment, Identifier [Axis]: HuFriedy Group Acquisition, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 7,851    
Investments, at fair value, ending balance 7,851 [2],[11] 7,851 [1],[6]  
Investment, Identifier [Axis]: HuFriedy Group Acquisition, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (9)    
Investments, at fair value, ending balance 0 [2],[11],[14] (9) [1],[6],[13]  
Investment, Identifier [Axis]: HuFriedy Group Acquisition, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (17)    
Investments, at fair value, ending balance 1,519 [2],[11] (17) [1],[6],[13]  
Investment, Identifier [Axis]: Hyland Software, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17],[18] 47,242    
Investments, at fair value, ending balance 46,767 [2],[11],[12] 47,242 [1],[6],[10],[17],[18]  
Investment, Identifier [Axis]: Hyland Software, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: ICIMS, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 11,845    
Investments, at fair value, ending balance 11,854 [2],[11],[12],[16] 11,845 [1],[6],[10],[15]  
Investment, Identifier [Axis]: ICIMS, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 80    
Investments, at fair value, ending balance 74 [2],[11] 80 [1],[6]  
Investment, Identifier [Axis]: ICIMS, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (103)    
Investments, at fair value, ending balance [1],[6],[13]   (103)  
Investment, Identifier [Axis]: IG Investments Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 9,122    
Investments, at fair value, ending balance 12,877 [2],[11],[12] 9,122 [1],[6],[18]  
Investment, Identifier [Axis]: IG Investments Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 782    
Investments, at fair value, ending balance 0 [2],[11] 782 [1],[6],[18]  
Investment, Identifier [Axis]: IG Investments Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: IMPLUS Footcare, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance    
Gross additions 23,769    
Gross reductions 0    
Net change in unrealized appreciation (depreciation) 0    
Net realized gain (loss)    
Investments, at fair value, ending balance 23,769  
Interest, dividend and fee income 238    
Investment, Identifier [Axis]: IMPLUS Footcare, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 27,450    
Investments, at fair value, ending balance 7,708 [2],[11],[16],[23] 27,450 [1],[6],[15]  
Investment, Identifier [Axis]: IMPLUS Footcare, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 4,688    
Investments, at fair value, ending balance 3,678 [2],[11],[16],[23] 4,688 [1],[6],[15]  
Investment, Identifier [Axis]: IMPLUS Footcare, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[15] 675    
Investments, at fair value, ending balance [1],[6],[7],[15]   675  
Investment, Identifier [Axis]: IQN Holding Corp., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18],[19] 22,887    
Investments, at fair value, ending balance 22,897 [2],[11],[12],[16] 22,887 [1],[6],[18],[19]  
Investment, Identifier [Axis]: IQN Holding Corp., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 52    
Investments, at fair value, ending balance 108 [2],[11] 52 [1],[6]  
Investment, Identifier [Axis]: IQN Holding Corp., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 4,046    
Investment, Identifier [Axis]: Icefall Parent, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,407    
Investments, at fair value, ending balance 3,184 [2],[11] 1,407 [1],[6],[10]  
Investment, Identifier [Axis]: Icefall Parent, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Illumifin Corporation, One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 4,018    
Investments, at fair value, ending balance 4,416 [2],[11],[16] 4,018 [1],[6],[10],[15]  
Investment, Identifier [Axis]: Impartner, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 211    
Investment, Identifier [Axis]: Impartner, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 217    
Investments, at fair value, ending balance [1],[6]   217  
Investment, Identifier [Axis]: Imperial Optical Midco Inc, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6] 40,558    
Investments, at fair value, ending balance [1],[3],[6]   40,558  
Investment, Identifier [Axis]: Imperial Optical Midco Inc, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[13] (282)    
Investments, at fair value, ending balance [1],[3],[6],[13]   (282)  
Investment, Identifier [Axis]: Imperial Optical Midco Inc, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[13] (1,502)    
Investments, at fair value, ending balance [1],[3],[6],[13]   (1,502)  
Investment, Identifier [Axis]: Imperial Optical Midco Inc.      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 93,864 0  
Gross additions   94,556  
Gross reductions   0  
Net change in unrealized appreciation (depreciation)   (692)  
Net realized gain (loss)   0  
Investments, at fair value, ending balance   93,864 0
Interest, dividend and fee income   1,008  
Investment, Identifier [Axis]: Inhabit IQ Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,488    
Investments, at fair value, ending balance [1],[6]   1,488  
Investment, Identifier [Axis]: Inhabit IQ Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 587    
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10],[18] 37,583    
Investments, at fair value, ending balance 6,873 [2],[11] 37,583 [1],[10],[18]  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,166    
Investments, at fair value, ending balance [1],[6],[10]   1,166  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 614    
Investments, at fair value, ending balance [1],[6],[10]   614  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10] 680    
Investments, at fair value, ending balance [1],[10]   680  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[19] 21,694    
Investments, at fair value, ending balance 0 [2],[11],[14] 21,694 [1],[6],[17],[19]  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 15,607    
Investments, at fair value, ending balance 0 [2],[11],[14] 15,607 [1],[6],[17]  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[20] 21,366    
Investments, at fair value, ending balance [1],[7],[20]   21,366  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[17],[19] 7,460    
Investments, at fair value, ending balance [1],[7],[17],[19]   7,460  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 3,988    
Investments, at fair value, ending balance [1],[6],[10]   3,988  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[19] 1,745    
Investments, at fair value, ending balance [1],[6],[10],[19]   1,745  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[19] 1,478    
Investments, at fair value, ending balance [1],[6],[10],[19]   1,478  
Investment, Identifier [Axis]: Inhabit IQ Inc., One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[19] 1,461    
Investments, at fair value, ending balance [1],[6],[10],[19]   1,461  
Investment, Identifier [Axis]: Inhance Parent, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Inhance Parent, Inc., LP units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 328    
Investment, Identifier [Axis]: Inhance Parent, Inc., LP units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Inhance Parent, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Inhance Parent, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 22,112    
Investment, Identifier [Axis]: Inhance Parent, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[22] 4,964    
Investment, Identifier [Axis]: Inhance Technologies Holdings LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Inhance Technologies Holdings LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4,902    
Investments, at fair value, ending balance [1],[6]   4,902  
Investment, Identifier [Axis]: Inhance Technologies Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15],[19] 12,257    
Investments, at fair value, ending balance [1],[6],[10],[15],[19]   12,257  
Investment, Identifier [Axis]: Inhance Technologies Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[15],[18],[19] 11,130    
Investments, at fair value, ending balance [1],[15],[18],[19]   11,130  
Investment, Identifier [Axis]: Inhance Technologies Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 2,165    
Investments, at fair value, ending balance [1],[6],[10],[15]   2,165  
Investment, Identifier [Axis]: Inhance Technologies Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 251    
Investments, at fair value, ending balance [1],[6],[15]   251  
Investment, Identifier [Axis]: Integrated Specialty Coverages, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,051    
Investments, at fair value, ending balance 10,111 [2],[11] 5,051 [1],[6],[10]  
Investment, Identifier [Axis]: Integrated Specialty Coverages, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Integrated Specialty Coverages, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,008    
Investments, at fair value, ending balance 0 [2],[11],[14] 1,008 [1],[6]  
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[18] 44,110    
Investments, at fair value, ending balance 48,347 [2],[11],[12] 44,110 [1],[6],[17],[18]  
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (4)    
Investments, at fair value, ending balance 0 [2],[11],[14] (4) [1],[6],[13]  
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (39)    
Investments, at fair value, ending balance 0 [2],[11],[14] (39) [1],[6],[13]  
Investment, Identifier [Axis]: Internet Truckstop Group, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 28,346    
Investments, at fair value, ending balance 28,345 [2],[12] 28,346 [1],[6],[17]  
Investment, Identifier [Axis]: Internet Truckstop Group, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 12,427    
Investments, at fair value, ending balance 12,427 [2],[11],[12] 12,427 [1],[6],[18]  
Investment, Identifier [Axis]: Internet Truckstop Group, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (3)    
Investments, at fair value, ending balance (3) [2],[11],[14] (3) [1],[6],[13]  
Investment, Identifier [Axis]: Inventus Power, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Inventus Power, Inc., Common stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 61    
Investment, Identifier [Axis]: Inventus Power, Inc., Common stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Inventus Power, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 276    
Investments, at fair value, ending balance 276 [2],[11] 276 [1],[6]  
Investment, Identifier [Axis]: Inventus Power, Inc., LP Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 61    
Investments, at fair value, ending balance [1],[6]   61  
Investment, Identifier [Axis]: Inventus Power, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 20    
Investments, at fair value, ending balance 168 [2],[11] 20 [1],[6]  
Investment, Identifier [Axis]: Island Bidco AB, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[15],[29],[48] 10,768    
Investments, at fair value, ending balance 12,125 [2],[11],[16],[26],[31],[49] 10,768 [1],[6],[9],[10],[15],[29],[48]  
Investment, Identifier [Axis]: Island Bidco AB, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[15],[48] 4,791    
Investments, at fair value, ending balance 4,961 [2],[11],[16],[26],[49] 4,791 [1],[6],[9],[10],[15],[48]  
Investment, Identifier [Axis]: Island Bidco AB, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[48] 3,535    
Investments, at fair value, ending balance 3,660 [2],[11],[16],[26],[49] 3,535 [1],[6],[9],[15],[48]  
Investment, Identifier [Axis]: Island Bidco AB, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[29],[48] 0    
Investments, at fair value, ending balance 0 [2],[11],[14],[26],[31],[49] 0 [1],[6],[9],[13],[29],[48]  
Investment, Identifier [Axis]: Island Bidco AB, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[48] 0    
Investments, at fair value, ending balance 88 [2],[11],[26],[49] 0 [1],[6],[9],[48]  
Investment, Identifier [Axis]: Isto Group, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[31] 365    
Investment, Identifier [Axis]: Isto Group, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Isto Group, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 585    
Investment, Identifier [Axis]: Isto Group, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: J.S. Held Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17],[20] 22,154    
Investments, at fair value, ending balance 37,835 [2],[11],[12] 22,154 [1],[6],[10],[17],[20]  
Investment, Identifier [Axis]: J.S. Held Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 5,346    
Investments, at fair value, ending balance 11,024 [2],[11] 5,346 [1],[6],[18]  
Investment, Identifier [Axis]: J.S. Held Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,171    
Investments, at fair value, ending balance 0 [2],[11] 5,171 [1],[6],[10]  
Investment, Identifier [Axis]: J.S. Held Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,005    
Investments, at fair value, ending balance [1],[6],[10]   5,005  
Investment, Identifier [Axis]: J.S. Held Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 159    
Investments, at fair value, ending balance [1],[6]   159  
Investment, Identifier [Axis]: J.S. Held Holdings, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (6)    
Investments, at fair value, ending balance [1],[6],[13]   (6)  
Investment, Identifier [Axis]: JHC Investment Intermediate Holdings, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 188    
Investments, at fair value, ending balance [1],[6]   188  
Investment, Identifier [Axis]: JHC Investment Intermediate Holdings, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,761    
Investment, Identifier [Axis]: JHC Investment Intermediate Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,351    
Investments, at fair value, ending balance 1,235 [2],[11],[16] 1,351 [1],[6],[15]  
Investment, Identifier [Axis]: JHC Investment Intermediate Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[21] 684    
Investments, at fair value, ending balance 922 [2],[11],[16] 684 [1],[6],[15],[21]  
Investment, Identifier [Axis]: JHCC Holdings LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 17,889    
Investments, at fair value, ending balance 17,708 [2],[12] 17,889 [1],[6],[17]  
Investment, Identifier [Axis]: JHCC Holdings LLC, One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 3,975    
Investment, Identifier [Axis]: JHCC Holdings LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,179    
Investments, at fair value, ending balance 6,887 [2],[11],[12] 5,179 [1],[6],[10]  
Investment, Identifier [Axis]: JHCC Holdings LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4,951    
Investments, at fair value, ending balance 5,127 [2],[11] 4,951 [1],[6]  
Investment, Identifier [Axis]: JHCC Holdings LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 3,714    
Investments, at fair value, ending balance 4,901 [2],[11] 3,714 [1],[6]  
Investment, Identifier [Axis]: JHCC Holdings LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,797    
Investments, at fair value, ending balance 2,764 [2],[11] 2,797 [1],[6]  
Investment, Identifier [Axis]: JHCC Holdings LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,659    
Investments, at fair value, ending balance 1,642 [2],[11] 1,659 [1],[6],[10]  
Investment, Identifier [Axis]: JHCC Holdings LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 732    
Investments, at fair value, ending balance 727 [2],[11] 732 [1],[6],[10]  
Investment, Identifier [Axis]: JHCC Holdings LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 695    
Investments, at fair value, ending balance 688 [2],[11] 695 [1],[6],[10]  
Investment, Identifier [Axis]: JHCC Holdings LLC, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 66    
Investments, at fair value, ending balance 80 [2],[11] 66 [1],[6]  
Investment, Identifier [Axis]: JSG II, Inc. and Checkers USA, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,426    
Investment, Identifier [Axis]: JSG II, Inc. and Checkers USA, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 13    
Investment, Identifier [Axis]: JSG II, Inc. and Checkers USA, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: Juvare, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[17] 10,221    
Investments, at fair value, ending balance [1],[7],[17]   10,221  
Investment, Identifier [Axis]: Juvare, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 2,359    
Investments, at fair value, ending balance [1],[6],[18]   2,359  
Investment, Identifier [Axis]: Juvare, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 745    
Investments, at fair value, ending balance [1],[6]   745  
Investment, Identifier [Axis]: Juvare, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 98    
Investments, at fair value, ending balance [1],[6]   98  
Investment, Identifier [Axis]: Kairos Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 10    
Investment, Identifier [Axis]: Kairos Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 601    
Investment, Identifier [Axis]: Kairos Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (1)    
Investment, Identifier [Axis]: Kairos Bidco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 90    
Investment, Identifier [Axis]: Kaseya Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 263    
Investment, Identifier [Axis]: Kaseya Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 267    
Investments, at fair value, ending balance [1],[6]   267  
Investment, Identifier [Axis]: Kaseya Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15],[20] 23,506    
Investments, at fair value, ending balance [1],[6],[10],[15],[20]   23,506  
Investment, Identifier [Axis]: Kaseya Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 271    
Investments, at fair value, ending balance [1],[6]   271  
Investment, Identifier [Axis]: Kaseya Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 136    
Investments, at fair value, ending balance [1],[6],[15]   136  
Investment, Identifier [Axis]: Kaseya Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 86    
Investments, at fair value, ending balance [1],[6]   86  
Investment, Identifier [Axis]: Kaseya Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 5,787    
Investments, at fair value, ending balance 3,635 [2],[11],[27] 5,787 [1],[6],[24]  
Investment, Identifier [Axis]: Kentik Technologies, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,944    
Investment, Identifier [Axis]: Kentik Technologies, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,578    
Investments, at fair value, ending balance 4 [2],[11] 1,578 [1],[6]  
Investment, Identifier [Axis]: Kentik Technologies, Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 56    
Investment, Identifier [Axis]: Kentik Technologies, Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 50    
Investment, Identifier [Axis]: Keystone Agency Partners LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 3,558    
Investments, at fair value, ending balance [1],[6],[10]   3,558  
Investment, Identifier [Axis]: Keystone Agency Partners LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,039    
Investments, at fair value, ending balance [1],[6]   2,039  
Investment, Identifier [Axis]: Keystone Agency Partners LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 2,875    
Investments, at fair value, ending balance [1],[6],[18]   2,875  
Investment, Identifier [Axis]: Keystone Agency Partners LLC, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 618    
Investments, at fair value, ending balance [1],[6],[10]   618  
Investment, Identifier [Axis]: Keystone Agency Partners LLC, Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,108    
Investments, at fair value, ending balance [1],[6]   2,108  
Investment, Identifier [Axis]: Kleinfelder Intermediate, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 4,087    
Investments, at fair value, ending balance [1],[6],[10]   4,087  
Investment, Identifier [Axis]: Kleinfelder Intermediate, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 120    
Investments, at fair value, ending balance [1],[6]   120  
Investment, Identifier [Axis]: Kleinfelder Intermediate, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: Kleinfelder Intermediate, LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 4,047    
Investment, Identifier [Axis]: Kleinfelder Intermediate, LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 93    
Investment, Identifier [Axis]: Kleinfelder Intermediate, LLC., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 439    
Investment, Identifier [Axis]: Klick Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[18] 13,629    
Investments, at fair value, ending balance 13,488 [2],[11],[12],[25],[26] 13,629 [1],[6],[8],[9],[18]  
Investment, Identifier [Axis]: Klick Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[13] 0    
Investments, at fair value, ending balance 3,155 [2],[12],[25],[26] 0 [1],[6],[8],[9],[13]  
Investment, Identifier [Axis]: Klick Inc., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9] 3,179    
Investments, at fair value, ending balance 0 [2],[11],[14],[25],[26] 3,179 [1],[6],[8],[9]  
Investment, Identifier [Axis]: Koala Investment Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 1,549    
Investment, Identifier [Axis]: Koala Investment Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[30] (1)    
Investment, Identifier [Axis]: Koala Investment Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[30] (3)    
Investment, Identifier [Axis]: Kodiak Buyer, LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 373    
Investment, Identifier [Axis]: Kodiak Buyer, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 611    
Investment, Identifier [Axis]: Kodiak Buyer, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (1)    
Investment, Identifier [Axis]: Kodiak Buyer, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (1)    
Investment, Identifier [Axis]: Kodiak Cakes, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 842    
Investments, at fair value, ending balance [1],[6],[24]   842  
Investment, Identifier [Axis]: Kodiak Cakes, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,914    
Investment, Identifier [Axis]: Kodiak Cakes, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 46,378    
Investments, at fair value, ending balance 45,911 [2],[11],[12] 46,378 [1],[6],[20]  
Investment, Identifier [Axis]: Kodiak Cakes, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Kona Buyer, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 15,674    
Investments, at fair value, ending balance 15,713 [2],[11] 15,674 [1],[6]  
Investment, Identifier [Axis]: Kona Buyer, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (19)    
Investments, at fair value, ending balance 0 [2],[11],[14] (19) [1],[6],[13]  
Investment, Identifier [Axis]: Kona Buyer, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 922 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Kona Buyer, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (23)    
Investments, at fair value, ending balance 259 [2],[11] (23) [1],[6],[13]  
Investment, Identifier [Axis]: Kona Buyer, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Kona Buyer, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Kona Buyer, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Kona Buyer, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Krayden Holdings, Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 9,741    
Investments, at fair value, ending balance 9,741 [2],[12] 9,741 [1],[6]  
Investment, Identifier [Axis]: Krayden Holdings, Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (34)    
Investments, at fair value, ending balance 645 [2],[11] (34) [1],[6],[13]  
Investment, Identifier [Axis]: Krayden Holdings, Inc., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (49)    
Investments, at fair value, ending balance 3,035 [2],[11] (49) [1],[6],[13]  
Investment, Identifier [Axis]: Krueger-Gilbert Health Physics, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 621    
Investments, at fair value, ending balance [1],[6]   621  
Investment, Identifier [Axis]: Krueger-Gilbert Health Physics, LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 683    
Investment, Identifier [Axis]: Krueger-Gilbert Health Physics, LLC, One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 671    
Investments, at fair value, ending balance 664 [2],[11] 671 [1],[6]  
Investment, Identifier [Axis]: Krueger-Gilbert Health Physics, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 2,599    
Investments, at fair value, ending balance 2,572 [2],[11],[12] 2,599 [1],[6],[17]  
Investment, Identifier [Axis]: Krueger-Gilbert Health Physics, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 2,386    
Investments, at fair value, ending balance 2,362 [2],[11],[12] 2,386 [1],[6],[17]  
Investment, Identifier [Axis]: Krueger-Gilbert Health Physics, LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 1,526    
Investments, at fair value, ending balance 1,509 [2],[12] 1,526 [1],[6],[17]  
Investment, Identifier [Axis]: Krueger-Gilbert Health Physics, LLC, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,395    
Investments, at fair value, ending balance 1,386 [2],[11],[12] 1,395 [1],[6]  
Investment, Identifier [Axis]: Krueger-Gilbert Health Physics, LLC, Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 615    
Investments, at fair value, ending balance 608 [2],[11] 615 [1],[6],[10]  
Investment, Identifier [Axis]: Krueger-Gilbert Health Physics, LLC, Senior secured 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 90 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Krueger-Gilbert Health Physics, LLC, Senior secured 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 90    
Investments, at fair value, ending balance 183 [2],[11] 90 [1],[6]  
Investment, Identifier [Axis]: Krueger-Gilbert Health Physics, LLC, Senior secured 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 297    
Investment, Identifier [Axis]: LDS Intermediate Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 7,334    
Investment, Identifier [Axis]: LDS Intermediate Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (11)    
Investment, Identifier [Axis]: LDS Intermediate Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,452    
Investment, Identifier [Axis]: LDS Intermediate Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (9)    
Investment, Identifier [Axis]: LDS Intermediate Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 90    
Investment, Identifier [Axis]: LMP TR Holdings, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1] 1,691    
Investments, at fair value, ending balance 0 [2] 1,691 [1]  
Investment, Identifier [Axis]: LOV Acquisition LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 25,123    
Investment, Identifier [Axis]: LOV Acquisition LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Lacker Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 634    
Investments, at fair value, ending balance 631 [2],[11],[26],[30],[31] 634 [1],[6],[9],[10],[28],[29]  
Investment, Identifier [Axis]: Lacker Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 142    
Investments, at fair value, ending balance 521 [2],[11],[26],[30],[31] 142 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Lacker Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[28],[29] 0    
Investments, at fair value, ending balance (1) [2],[11],[14],[26],[30],[31] 0 [1],[6],[9],[13],[28],[29]  
Investment, Identifier [Axis]: LeadsOnline, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 13,049    
Investments, at fair value, ending balance 12,917 [2],[11] 13,049 [1],[6],[20]  
Investment, Identifier [Axis]: LeadsOnline, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,303    
Investments, at fair value, ending balance 2,280 [2],[11] 2,303 [1],[6],[10]  
Investment, Identifier [Axis]: LeadsOnline, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 667    
Investments, at fair value, ending balance 661 [2],[11] 667 [1],[6],[10]  
Investment, Identifier [Axis]: LeadsOnline, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Learn-it Systems, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 3,381    
Investments, at fair value, ending balance [1],[6],[10],[15]   3,381  
Investment, Identifier [Axis]: Learn-it Systems, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,991    
Investments, at fair value, ending balance [1],[6],[15]   1,991  
Investment, Identifier [Axis]: Learn-it Systems, LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 847    
Investments, at fair value, ending balance [1],[6],[15]   847  
Investment, Identifier [Axis]: Learn-it Systems, LLC, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Lighthouse Bidco GMBH, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[31],[47] 20,056    
Investment, Identifier [Axis]: Lighthouse Bidco GMBH, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[31],[47] 0    
Investment, Identifier [Axis]: Lighthouse Bidco GMBH, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[31],[47] 0    
Investment, Identifier [Axis]: Lightning Finco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 14,802    
Investments, at fair value, ending balance 14,802 [2],[11],[26],[43] 14,802 [1],[6],[9],[28]  
Investment, Identifier [Axis]: Lightning Finco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 1,692    
Investments, at fair value, ending balance 1,783 [2],[11],[26],[31],[43] 1,692 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Liminex, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 681    
Investments, at fair value, ending balance [1],[6]   681  
Investment, Identifier [Axis]: Liminex, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 35,650    
Investments, at fair value, ending balance 35,383 [2],[11] 35,650 [1],[6],[10]  
Investment, Identifier [Axis]: Liminex, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 23,516    
Investments, at fair value, ending balance 23,340 [2],[11] 23,516 [1],[6],[10]  
Investment, Identifier [Axis]: Liminex, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 15,953    
Investments, at fair value, ending balance 20,168 [2],[11] 15,953 [1],[6],[10]  
Investment, Identifier [Axis]: Liminex, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[20] 20,321    
Investments, at fair value, ending balance 15,833 [2],[11] 20,321 [1],[6],[10],[20]  
Investment, Identifier [Axis]: Liminex, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 410    
Investment, Identifier [Axis]: Litera Bidco, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 5,201    
Investments, at fair value, ending balance 5,149 [2],[12] 5,201 [1],[6],[17]  
Investment, Identifier [Axis]: Litera Bidco, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,060    
Investments, at fair value, ending balance 2,055 [2],[11] 1,060 [1],[6]  
Investment, Identifier [Axis]: Litera Bidco, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 52 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Litera Bidco, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: LogicMonitor, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 277    
Investment, Identifier [Axis]: LogicMonitor, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 53,749    
Investment, Identifier [Axis]: LogicMonitor, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Lotus Topco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 5,164    
Investments, at fair value, ending balance 5,073 [2],[12] 5,164 [1],[6]  
Investment, Identifier [Axis]: Lotus Topco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance (8) [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Lotus Topco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 628 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Lotus Topco, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,985    
Investment, Identifier [Axis]: Louisiana Fish Fry Products, Ltd., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 331    
Investments, at fair value, ending balance [1],[6]   331  
Investment, Identifier [Axis]: Louisiana Fish Fry Products, Ltd., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[10],[17] 13,564    
Investments, at fair value, ending balance 13,559 [2],[11],[12] 13,564 [1],[6],[7],[10],[17]  
Investment, Identifier [Axis]: Louisiana Fish Fry Products, Ltd., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 192    
Investments, at fair value, ending balance 254 [2],[11] 192 [1],[6]  
Investment, Identifier [Axis]: Louisiana Fish Fry Products, Ltd., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 36    
Investments, at fair value, ending balance [1],[6]   36  
Investment, Identifier [Axis]: Louisiana Fish Fry Products, Ltd., Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 273    
Investment, Identifier [Axis]: Louisiana Fish Fry Products, Ltd., Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 36    
Investment, Identifier [Axis]: MAPF Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[17],[18],[19],[20] 46,258    
Investments, at fair value, ending balance 49,895 [2],[11] 46,258 [1],[6],[7],[17],[18],[19],[20]  
Investment, Identifier [Axis]: MAPF Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 534    
Investments, at fair value, ending balance 522 [2],[11] 534 [1],[6]  
Investment, Identifier [Axis]: MAPF Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,482    
Investments, at fair value, ending balance 1,600 [2],[11] 1,482 [1],[6],[10]  
Investment, Identifier [Axis]: MAPF Holdings, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,076    
Investments, at fair value, ending balance 2,091 [2],[11],[16] 1,076 [1],[6]  
Investment, Identifier [Axis]: MMan Acquisition Co.      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 12,205 12,790  
Gross additions 490 11,979  
Gross reductions 0 (11,344)  
Net change in unrealized appreciation (depreciation) (833) 10,406  
Net realized gain (loss) 0 (11,626)  
Investments, at fair value, ending balance 11,862 12,205 12,790
Interest, dividend and fee income 510 439  
Investment, Identifier [Axis]: MMan Acquisition Co., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[4],[6],[15] 1,073    
Investments, at fair value, ending balance [1],[4],[6],[15]   1,073  
Investment, Identifier [Axis]: MMan Acquisition Co., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[4],[6],[15] 1,813    
Investments, at fair value, ending balance 2,030 [2],[11],[16] 1,813 [1],[4],[6],[15]  
Investment, Identifier [Axis]: MMan Acquisition Co., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 1,209    
Investment, Identifier [Axis]: MMan Acquisition Co., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[4],[6],[15] 1,153    
Investments, at fair value, ending balance 1,300 [2],[11],[16] 1,153 [1],[4],[6],[15]  
Investment, Identifier [Axis]: MMan Acquisition Co., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[4],[6],[15] 334    
Investments, at fair value, ending balance 376 [2],[11],[16] 334 [1],[4],[6],[15]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 473    
Investment, Identifier [Axis]: MOP GM Holding, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 546    
Investments, at fair value, ending balance [1],[6]   546  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[17],[19],[20] 32,559    
Investments, at fair value, ending balance 31,896 [2],[11],[12] 32,559 [1],[6],[7],[17],[19],[20]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 396    
Investments, at fair value, ending balance 392 [2],[11] 396 [1],[6]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 264    
Investments, at fair value, ending balance 259 [2],[11] 264 [1],[6]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 201    
Investments, at fair value, ending balance 197 [2],[11] 201 [1],[6]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 88    
Investments, at fair value, ending balance 86 [2],[11] 88 [1],[6]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 14      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 88    
Investments, at fair value, ending balance 86 [2],[11] 88 [1],[6]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 15      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 3,827    
Investments, at fair value, ending balance 3,749 [2],[11] 3,827 [1],[6],[18]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 3,581    
Investments, at fair value, ending balance 3,508 [2],[11],[12] 3,581 [1],[6],[17]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 3,502    
Investments, at fair value, ending balance 3,430 [2],[11],[12] 3,502 [1],[6],[20]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 2,594    
Investments, at fair value, ending balance 2,541 [2],[11],[12] 2,594 [1],[6],[20]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 2,140    
Investments, at fair value, ending balance 2,097 [2],[11] 2,140 [1],[6],[18]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 1,973    
Investments, at fair value, ending balance 1,932 [2],[11] 1,973 [1],[6],[18]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 718    
Investments, at fair value, ending balance 704 [2],[11] 718 [1],[6]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 528    
Investments, at fair value, ending balance 517 [2],[11] 528 [1],[6]  
Investment, Identifier [Axis]: MOP GM Holding, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 36    
Investments, at fair value, ending balance 63 [2],[11] 36 [1],[6]  
Investment, Identifier [Axis]: MRH Trowe Germany GMBH, One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[46] 789    
Investments, at fair value, ending balance [1],[6],[9],[29],[46]   789  
Investment, Identifier [Axis]: MRH Trowe Germany GMBH, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[31],[47] 0    
Investment, Identifier [Axis]: MRH Trowe Germany GMBH, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[31],[47] 6,242    
Investment, Identifier [Axis]: MRH Trowe Germany GMBH, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[31],[47] 236    
Investment, Identifier [Axis]: MRI Software, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[17],[20] 28,625    
Investments, at fair value, ending balance 32,733 [2],[11],[12] 28,625 [1],[6],[7],[17],[20]  
Investment, Identifier [Axis]: MRI Software, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[18],[20] 13,023    
Investments, at fair value, ending balance 13,019 [2],[11],[12] 13,023 [1],[6],[17],[18],[20]  
Investment, Identifier [Axis]: MRI Software, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (31)    
Investments, at fair value, ending balance 316 [2],[11] (31) [1],[6],[13]  
Investment, Identifier [Axis]: MRI Software, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 938    
Investments, at fair value, ending balance 9,830 [2],[11] 938 [1],[6]  
Investment, Identifier [Axis]: MRI Software, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 3,086    
Investments, at fair value, ending balance [1],[6]   3,086  
Investment, Identifier [Axis]: MWD Management, LLC & MWD Services, Inc., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 660    
Investments, at fair value, ending balance 620 [2],[11] 660 [1],[6]  
Investment, Identifier [Axis]: MYOB Invest Co Pty Ltd, One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[31],[50] 36,379    
Investment, Identifier [Axis]: Majesco, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 324    
Investments, at fair value, ending balance [1],[6]   324  
Investment, Identifier [Axis]: Majesco, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10],[17],[20] 28,248    
Investments, at fair value, ending balance 27,954 [2],[11],[12] 28,248 [1],[10],[17],[20]  
Investment, Identifier [Axis]: Majesco, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Majesco, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 611    
Investments, at fair value, ending balance 321 [2],[11] 611 [1],[6],[24]  
Investment, Identifier [Axis]: Majesco, Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 668    
Investment, Identifier [Axis]: MakerSights, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 101    
Investment, Identifier [Axis]: MakerSights, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 104    
Investments, at fair value, ending balance [1],[6]   104  
Investment, Identifier [Axis]: Marcone Yellowstone Buyer Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 17,915    
Investments, at fair value, ending balance 18,619 [2],[11],[16] 17,915 [1],[6],[10]  
Investment, Identifier [Axis]: Marcone Yellowstone Buyer Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[18] 18,583    
Investments, at fair value, ending balance 19,313 [2],[11],[16] 18,583 [1],[6],[10],[18]  
Investment, Identifier [Axis]: Marcone Yellowstone Buyer Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,563    
Investments, at fair value, ending balance 5,765 [2],[11],[16] 5,563 [1],[6],[10]  
Investment, Identifier [Axis]: Marcone Yellowstone Buyer Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,274    
Investments, at fair value, ending balance 2,363 [2],[11],[16] 2,274 [1],[6],[10]  
Investment, Identifier [Axis]: Marcone Yellowstone Buyer Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 5,953    
Investments, at fair value, ending balance 6,187 [2],[11],[16] 5,953 [1],[6],[18]  
Investment, Identifier [Axis]: Mario Purchaser, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 410    
Investments, at fair value, ending balance 10,817 [2],[11],[12] 410 [1],[6]  
Investment, Identifier [Axis]: Mario Purchaser, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 11,270    
Investments, at fair value, ending balance 4,981 [2],[11] 11,270 [1],[6],[10]  
Investment, Identifier [Axis]: Mario Purchaser, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 4,384    
Investments, at fair value, ending balance 5,061 [2],[11],[16] 4,384 [1],[6],[15]  
Investment, Identifier [Axis]: Mario Purchaser, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 5,188    
Investments, at fair value, ending balance 433 [2],[11] 5,188 [1],[6]  
Investment, Identifier [Axis]: Mario Purchaser, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 14    
Investments, at fair value, ending balance 50 [2],[11] 14 [1],[6]  
Investment, Identifier [Axis]: Massage Envy, LLC, LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,682    
Investments, at fair value, ending balance 1,930 [2],[11] 1,682 [1],[6]  
Investment, Identifier [Axis]: Matrix42 Holding GMBH, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[29],[36] 10,121    
Investments, at fair value, ending balance 10,588 [2],[11],[26],[31],[47] 10,121 [1],[6],[9],[10],[29],[36]  
Investment, Identifier [Axis]: Matrix42 Holding GMBH, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[29],[36] 1,533    
Investments, at fair value, ending balance 1,604 [2],[11],[26],[31],[47] 1,533 [1],[6],[9],[10],[29],[36]  
Investment, Identifier [Axis]: Matrix42 Holding GMBH, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[29],[36] 789    
Investments, at fair value, ending balance 826 [2],[11],[26],[31],[47] 789 [1],[6],[9],[10],[29],[36]  
Investment, Identifier [Axis]: Matrix42 Holding GMBH, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[29],[36] 0    
Investments, at fair value, ending balance (2) [2],[11],[14],[26],[31],[47] 0 [1],[6],[9],[13],[29],[36]  
Investment, Identifier [Axis]: Matrix42 Holding GMBH, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[36] 0    
Investments, at fair value, ending balance 0 [2],[11],[26],[47] 0 [1],[6],[9],[36]  
Investment, Identifier [Axis]: Matrix42 Holding GMBH, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[31],[47] 2,025    
Investment, Identifier [Axis]: Medlar Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[31],[51] 26,485    
Investment, Identifier [Axis]: Medlar Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[31],[51] 32,952    
Investment, Identifier [Axis]: Medlar Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[31],[51] 0    
Investment, Identifier [Axis]: Mendocino Farms, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 1,433    
Investments, at fair value, ending balance 1,421 [2],[11] 1,433 [1],[6],[24]  
Investment, Identifier [Axis]: Mendocino Farms, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,001    
Investments, at fair value, ending balance 991 [2],[11] 1,001 [1],[6],[10]  
Investment, Identifier [Axis]: Mendocino Farms, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 56 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Mendocino Farms, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Mendocino Farms, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 112    
Investments, at fair value, ending balance 110 [2],[11] 112 [1],[6]  
Investment, Identifier [Axis]: Mendocino Farms, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 111    
Investment, Identifier [Axis]: Mendocino Farms, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Mendocino Farms, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 56    
Investment, Identifier [Axis]: Mendocino Farms, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 56    
Investment, Identifier [Axis]: Menlo Ridgeview Co-Invest, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26] 996    
Investment, Identifier [Axis]: Messenger, LLC, LLC units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 620    
Investments, at fair value, ending balance [1],[6]   620  
Investment, Identifier [Axis]: Messenger, LLC, LLC units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Messenger, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17],[19] 14,397    
Investments, at fair value, ending balance 14,039 [2],[11],[12] 14,397 [1],[6],[10],[17],[19]  
Investment, Identifier [Axis]: Messenger, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29] 926    
Investments, at fair value, ending balance 907 [2],[11],[31] 926 [1],[6],[9],[29]  
Investment, Identifier [Axis]: Messenger, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 507    
Investment, Identifier [Axis]: Messenger, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29] 0    
Investments, at fair value, ending balance 9 [2],[11],[31] 0 [1],[6],[9],[29]  
Investment, Identifier [Axis]: Messenger, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 1,508    
Investments, at fair value, ending balance 1,471 [2],[11],[12] 1,508 [1],[6],[17]  
Investment, Identifier [Axis]: Messenger, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 756    
Investments, at fair value, ending balance 738 [2],[11] 756 [1],[6],[10]  
Investment, Identifier [Axis]: Messenger, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Messenger, LLC, One stop3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 520    
Investments, at fair value, ending balance [1],[6]   520  
Investment, Identifier [Axis]: Messenger, LLC, Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 853    
Investment, Identifier [Axis]: Messenger, LLC, Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Metal Supermarkets US Buyer, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26] 370    
Investment, Identifier [Axis]: Metal Supermarkets US Buyer, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26] 11,489    
Investment, Identifier [Axis]: Metal Supermarkets US Buyer, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26] 306    
Investment, Identifier [Axis]: Metal Supermarkets US Buyer, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26] 29    
Investment, Identifier [Axis]: Metatiedot Bidco Oy & Metatiedot US, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[31],[52] 17,267    
Investment, Identifier [Axis]: Metatiedot Bidco Oy & Metatiedot US, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[52] 11,017    
Investment, Identifier [Axis]: Metatiedot Bidco Oy & Metatiedot US, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[31],[52] 140    
Investment, Identifier [Axis]: Metatiedot Bidco Oy & Metatiedot US, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[31],[52] 0    
Investment, Identifier [Axis]: Midwest Veterinary Partners, LLC, Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 2,123    
Investments, at fair value, ending balance [1],[6],[24]   2,123  
Investment, Identifier [Axis]: Midwest Veterinary Partners, LLC, Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 68    
Investments, at fair value, ending balance [1],[6],[24]   68  
Investment, Identifier [Axis]: Midwest Veterinary Partners, LLC, Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 482    
Investments, at fair value, ending balance [1],[6]   482  
Investment, Identifier [Axis]: Mindbody, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 61,966    
Investments, at fair value, ending balance 61,966 [2],[11] 61,966 [1],[6],[10]  
Investment, Identifier [Axis]: Mindbody, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,134    
Investments, at fair value, ending balance 2,134 [2],[11] 2,134 [1],[6],[10]  
Investment, Identifier [Axis]: Mindbody, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Ministry Brands Holdings LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 704    
Investments, at fair value, ending balance [1],[6]   704  
Investment, Identifier [Axis]: Ministry Brands Holdings LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 30,448    
Investments, at fair value, ending balance 30,137 [2],[11] 30,448 [1],[6],[10]  
Investment, Identifier [Axis]: Ministry Brands Holdings LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,864    
Investments, at fair value, ending balance 2,835 [2],[11] 2,864 [1],[6]  
Investment, Identifier [Axis]: Ministry Brands Holdings LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (6)    
Investments, at fair value, ending balance (6) [2],[11] (6) [1],[6],[13]  
Investment, Identifier [Axis]: Ministry Brands Holdings LLC, Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 613    
Investment, Identifier [Axis]: Modernizing Medicine, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 32,379    
Investment, Identifier [Axis]: Modernizing Medicine, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Modernizing Medicine, Inc., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 4,794    
Investment, Identifier [Axis]: Movement Holdings, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 136    
Investments, at fair value, ending balance [1],[6]   136  
Investment, Identifier [Axis]: Movement Holdings, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 87    
Investment, Identifier [Axis]: Movement Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 841    
Investments, at fair value, ending balance 832 [2],[11],[26],[30] 841 [1],[6],[10]  
Investment, Identifier [Axis]: Movement Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11],[26],[30] 0 [1],[6]  
Investment, Identifier [Axis]: Movement Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14],[26],[30] 0 [1],[6],[13]  
Investment, Identifier [Axis]: NBG Acquisition Corp. and NBG-P Acquisition Corp., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10],[17],[18],[19],[20] 33,004    
Investments, at fair value, ending balance 31,939 [2],[11],[12],[16] 33,004 [1],[10],[17],[18],[19],[20]  
Investment, Identifier [Axis]: NBG Acquisition Corp. and NBG-P Acquisition Corp., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 767    
Investments, at fair value, ending balance 743 [2],[11],[16] 767 [1],[6]  
Investment, Identifier [Axis]: NBG Acquisition Corp. and NBG-P Acquisition Corp., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 292    
Investments, at fair value, ending balance 264 [2],[11],[16] 292 [1],[6]  
Investment, Identifier [Axis]: NDX Parent, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 11    
Investments, at fair value, ending balance [1],[6]   11  
Investment, Identifier [Axis]: NDX Parent, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 82    
Investments, at fair value, ending balance [1],[6]   82  
Investment, Identifier [Axis]: NSG Buyer, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9] 3,616    
Investments, at fair value, ending balance [1],[6],[9]   3,616  
Investment, Identifier [Axis]: NSG Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[18],[19] 34,589    
Investments, at fair value, ending balance 38,051 [2],[11],[12] 34,589 [1],[6],[7],[18],[19]  
Investment, Identifier [Axis]: NSG Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 145 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: NSG Buyer, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: NSG Buyer, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,785    
Investments, at fair value, ending balance 0 [2],[11],[14] 1,785 [1],[6]  
Investment, Identifier [Axis]: NSG Buyer, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 4,203    
Investment, Identifier [Axis]: National Express Wash Parent Holdco, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 176    
Investment, Identifier [Axis]: National Express Wash Parent Holdco, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 134    
Investments, at fair value, ending balance [1],[6]   134  
Investment, Identifier [Axis]: National Express Wash Parent Holdco, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 9,428    
Investments, at fair value, ending balance 13,281 [2],[11] 9,428 [1],[6],[18]  
Investment, Identifier [Axis]: National Express Wash Parent Holdco, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 132    
Investments, at fair value, ending balance 1,447 [2],[11] 132 [1],[6]  
Investment, Identifier [Axis]: National Express Wash Parent Holdco, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 1,280 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: National Express Wash Parent Holdco, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 692    
Investment, Identifier [Axis]: Navex TopCo, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,382    
Investments, at fair value, ending balance 5,329 [2],[11] 5,382 [1],[6],[10]  
Investment, Identifier [Axis]: Navex TopCo, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Naviga Inc., Senior secured      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[21] 48    
Investments, at fair value, ending balance 67 [2],[11],[16],[22] 48 [1],[6],[21]  
Investment, Identifier [Axis]: Neptune Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 16,180    
Investments, at fair value, ending balance 16,017 [2],[12] 16,180 [1],[6],[17]  
Investment, Identifier [Axis]: Neptune Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Net Health Acquisition Corp., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,311    
Investments, at fair value, ending balance 2,417 [2],[11] 2,311 [1],[6]  
Investment, Identifier [Axis]: Netsmart Technologies, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 50,812    
Investments, at fair value, ending balance 52,670 [2],[11],[16] 50,812 [1],[6],[15]  
Investment, Identifier [Axis]: Netsmart Technologies, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (70)    
Investments, at fair value, ending balance 0 [2],[11],[14] (70) [1],[6],[13]  
Investment, Identifier [Axis]: Netsmart Technologies, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (34)    
Investments, at fair value, ending balance 0 [2],[11],[14] (34) [1],[6],[13]  
Investment, Identifier [Axis]: Netwrix Corporation, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 18    
Investment, Identifier [Axis]: Netwrix Corporation, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 18    
Investments, at fair value, ending balance [1],[6]   18  
Investment, Identifier [Axis]: Netwrix Corporation, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[18] 7,975    
Investments, at fair value, ending balance 9,541 [2],[11],[12] 7,975 [1],[6],[7],[18]  
Investment, Identifier [Axis]: Netwrix Corporation, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 383 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Netwrix Corporation, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 422    
Investments, at fair value, ending balance 162 [2],[11] 422 [1],[6]  
Investment, Identifier [Axis]: Netwrix Corporation, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: New Look (Delaware) Corporation and NL1 AcquireCo, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 311    
Investments, at fair value, ending balance [1],[6],[8],[9],[29]   311  
Investment, Identifier [Axis]: New Look (Delaware) Corporation and NL1 AcquireCo, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[10],[15],[29] 25,165    
Investments, at fair value, ending balance [1],[6],[8],[9],[10],[15],[29]   25,165  
Investment, Identifier [Axis]: New Look (Delaware) Corporation and NL1 AcquireCo, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[8],[9],[10],[19] 5,646    
Investments, at fair value, ending balance [1],[8],[9],[10],[19]   5,646  
Investment, Identifier [Axis]: New Look (Delaware) Corporation and NL1 AcquireCo, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[10],[19] 3,984    
Investments, at fair value, ending balance [1],[6],[8],[9],[10],[19]   3,984  
Investment, Identifier [Axis]: New Look (Delaware) Corporation and NL1 AcquireCo, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 1,576    
Investments, at fair value, ending balance [1],[6],[8],[9],[29]   1,576  
Investment, Identifier [Axis]: New Look (Delaware) Corporation and NL1 AcquireCo, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 821    
Investments, at fair value, ending balance [1],[6],[8],[9],[29]   821  
Investment, Identifier [Axis]: New Look (Delaware) Corporation and NL1 AcquireCo, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[15] 125    
Investments, at fair value, ending balance [1],[6],[8],[9],[15]   125  
Investment, Identifier [Axis]: New Look (Delaware) Corporation and NL1 AcquireCo, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 65    
Investments, at fair value, ending balance [1],[6],[8],[9],[29]   65  
Investment, Identifier [Axis]: New Look (Delaware) Corporation and NL1 AcquireCo, Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[13] (4)    
Investments, at fair value, ending balance [1],[6],[8],[9],[13]   (4)  
Investment, Identifier [Axis]: New Look Corporation and New Look Vision Group Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26],[31] 451    
Investment, Identifier [Axis]: New Look Corporation and New Look Vision Group Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[25],[26],[31] 25,477    
Investment, Identifier [Axis]: New Look Corporation and New Look Vision Group Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12],[25],[26] 5,821    
Investment, Identifier [Axis]: New Look Corporation and New Look Vision Group Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12],[25],[26] 4,107    
Investment, Identifier [Axis]: New Look Corporation and New Look Vision Group Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26],[31] 1,578    
Investment, Identifier [Axis]: New Look Corporation and New Look Vision Group Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26],[31] 822    
Investment, Identifier [Axis]: New Look Corporation and New Look Vision Group Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26],[31] 154    
Investment, Identifier [Axis]: New Look Corporation and New Look Vision Group Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[25],[26] 130    
Investment, Identifier [Axis]: New Look Corporation and New Look Vision Group Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[25],[26] 0    
Investment, Identifier [Axis]: North Haven Falcon Buyer, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 7,285    
Investments, at fair value, ending balance 4,025 [2],[11],[16],[22] 7,285 [1],[6],[10],[15]  
Investment, Identifier [Axis]: North Haven Falcon Buyer, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,220    
Investments, at fair value, ending balance 673 [2],[11],[16],[22] 1,220 [1],[6],[15]  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1] 846    
Investments, at fair value, ending balance [1]   846  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 157    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[12] 1,352    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 199    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 99    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 819    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 14      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 2,258    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 15      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 479    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 16      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 901    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 17      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 682    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 18      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 757    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 19      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 23    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 1,548    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 20      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 331    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 21      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,334    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 23      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 24      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,078    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 25      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 926    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 26      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 102    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 27      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 205    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 28      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 80    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,364    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 281    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 12,160    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 1,466    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,404    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[12] 4,097    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,357    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2] 1,244    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Second lien 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 1,542 [2],[11],[16] 0 [1],[6],[13]  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Second lien 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 2,290    
Investments, at fair value, ending balance 0 [2],[11],[14] 2,290 [1],[6],[15]  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Second lien 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,511    
Investments, at fair value, ending balance 2,342 [2],[11],[16] 1,511 [1],[6],[15]  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Second lien 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 389    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,568    
Investments, at fair value, ending balance [1],[6]   1,568  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 201    
Investments, at fair value, ending balance [1],[6]   201  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 100    
Investments, at fair value, ending balance [1],[6]   100  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 166    
Investments, at fair value, ending balance [1],[6]   166  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,287    
Investments, at fair value, ending balance [1],[6]   2,287  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 14      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 485    
Investments, at fair value, ending balance [1],[6]   485  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 15      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 910    
Investments, at fair value, ending balance [1],[6]   910  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 16      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 689    
Investments, at fair value, ending balance [1],[6]   689  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 158    
Investments, at fair value, ending balance [1],[6]   158  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 285    
Investments, at fair value, ending balance [1],[6]   285  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[10],[17],[19] 12,315    
Investments, at fair value, ending balance [1],[7],[10],[17],[19]   12,315  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,485    
Investments, at fair value, ending balance [1],[6]   1,485  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,422    
Investments, at fair value, ending balance [1],[6]   1,422  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[17],[19] 4,149    
Investments, at fair value, ending balance [1],[17],[19]   4,149  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,374    
Investments, at fair value, ending balance [1],[6]   1,374  
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, Senior secured 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[17],[19] 1,369    
Investments, at fair value, ending balance [1],[17],[19]   1,369  
Investment, Identifier [Axis]: Norvax, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[20] 38,860    
Investments, at fair value, ending balance [1],[6],[9],[10],[20]   38,860  
Investment, Identifier [Axis]: Norvax, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10] 12,026    
Investments, at fair value, ending balance [1],[6],[9],[10]   12,026  
Investment, Identifier [Axis]: OEConnection, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 10,288    
Investments, at fair value, ending balance 10,219 [2],[12] 10,288 [1],[6],[17]  
Investment, Identifier [Axis]: OEConnection, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 1,784 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: OEConnection, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 3 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: OEConnection, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 23    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,745    
Investments, at fair value, ending balance [1],[6],[10]   1,745  
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 331    
Investments, at fair value, ending balance [1],[6]   331  
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,727    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,652    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 270    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 19    
Investment, Identifier [Axis]: Oakbridge Insurance Agency LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 412    
Investments, at fair value, ending balance [1],[6]   412  
Investment, Identifier [Axis]: Oakbridge Insurance Agency LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,281    
Investments, at fair value, ending balance 2,258 [2],[11] 2,281 [1],[6],[10]  
Investment, Identifier [Axis]: Oakbridge Insurance Agency LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 30    
Investments, at fair value, ending balance 1,091 [2],[11] 30 [1],[6]  
Investment, Identifier [Axis]: Oakbridge Insurance Agency LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 91    
Investments, at fair value, ending balance 4 [2],[11] 91 [1],[6]  
Investment, Identifier [Axis]: Oakbridge Insurance Agency LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 276    
Investment, Identifier [Axis]: Oakbridge Insurance Agency LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 506    
Investment, Identifier [Axis]: Olo Parent, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Olo Parent, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,822    
Investment, Identifier [Axis]: Onapsis, Inc., Virtual Forge GMBH and Onapsis GMBH, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 17    
Investment, Identifier [Axis]: Onapsis, Inc., Virtual Forge GMBH and Onapsis GMBH, Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 20    
Investments, at fair value, ending balance [1],[6]   20  
Investment, Identifier [Axis]: Onit, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 14    
Investment, Identifier [Axis]: Onit, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 5,428    
Investment, Identifier [Axis]: Onit, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Onit, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Onit, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,444    
Investment, Identifier [Axis]: Onit, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 128    
Investments, at fair value, ending balance [1],[6],[24]   128  
Investment, Identifier [Axis]: Onit, Inc., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 20    
Investments, at fair value, ending balance [1],[6]   20  
Investment, Identifier [Axis]: Opening Day Borrower 111 LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 24,936 24,438  
Gross additions 12,900 27,853  
Gross reductions (8,225) (23,040)  
Net change in unrealized appreciation (depreciation) (6,375) (4,272)  
Net realized gain (loss) 0 (43)  
Investments, at fair value, ending balance 23,236 24,936 24,438
Interest, dividend and fee income 303 629  
Investment, Identifier [Axis]: Opening Day Borrower 111 LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[32],[33] 3,764    
Investments, at fair value, ending balance [1],[3],[6],[32],[33]   3,764  
Investment, Identifier [Axis]: Opening Day Borrower 111 LLC, LP units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 18,561    
Investment, Identifier [Axis]: Opening Day Borrower 111 LLC, LP units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Opening Day Borrower 111 LLC, One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[23] 4,675    
Investment, Identifier [Axis]: Opening Day Borrower 111 LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6] 0    
Investments, at fair value, ending balance [1],[3],[6]   0  
Investment, Identifier [Axis]: Opening Day Borrower 111 LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6] 0    
Investments, at fair value, ending balance [1],[3],[6]   0  
Investment, Identifier [Axis]: Opening Day Borrower 111 LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[32],[33] 21,172    
Investments, at fair value, ending balance [1],[3],[6],[32],[33]   21,172  
Investment, Identifier [Axis]: Optimizely North America, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,528    
Investments, at fair value, ending balance [1],[6]   1,528  
Investment, Identifier [Axis]: Optimizely North America, Inc., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,369    
Investment, Identifier [Axis]: Optimizely North America, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10],[19],[20] 25,860    
Investments, at fair value, ending balance 38,128 [2],[11] 25,860 [1],[10],[19],[20]  
Investment, Identifier [Axis]: Optimizely North America, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29] 23,933    
Investments, at fair value, ending balance 15,843 [2],[11],[31] 23,933 [1],[6],[9],[29]  
Investment, Identifier [Axis]: Optimizely North America, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[19],[20] 14,317    
Investments, at fair value, ending balance 5,979 [2],[11],[31] 14,317 [1],[7],[19],[20]  
Investment, Identifier [Axis]: Optimizely North America, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[10] 7,956    
Investments, at fair value, ending balance 0 [2],[11],[14] 7,956 [1],[7],[10]  
Investment, Identifier [Axis]: Optimizely North America, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Orsay Bidco 1 B.V. and Sky Group Holding B.V., One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[29],[34] 0    
Investments, at fair value, ending balance [1],[6],[9],[13],[29],[34]   0  
Investment, Identifier [Axis]: Orsay Bidco 1 B.V. and Sky Group Holding B.V., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[31],[35] 2,327    
Investment, Identifier [Axis]: Orsay Bidco 1 B.V. and Sky Group Holding B.V., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[31],[35] 347    
Investment, Identifier [Axis]: P&P Food Safety Holdings, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 238    
Investments, at fair value, ending balance 312 [2],[11] 238 [1],[6]  
Investment, Identifier [Axis]: P&P Food Safety Holdings, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 42    
Investment, Identifier [Axis]: P&P Food Safety Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[17],[18] 24,068    
Investments, at fair value, ending balance 13,105 [2],[11],[12] 24,068 [1],[6],[7],[17],[18]  
Investment, Identifier [Axis]: P&P Food Safety Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (6)    
Investments, at fair value, ending balance 0 [2],[11],[14] (6) [1],[6],[13]  
Investment, Identifier [Axis]: P&P Food Safety Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[31] 12,104    
Investment, Identifier [Axis]: P&P Food Safety Holdings, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: P&P Food Safety Holdings, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 35    
Investments, at fair value, ending balance [1],[6]   35  
Investment, Identifier [Axis]: PADI Holdco, Inc., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 868    
Investments, at fair value, ending balance 1,392 [2],[11],[27] 868 [1],[6]  
Investment, Identifier [Axis]: PADI Holdco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[7],[19] 21,353    
Investments, at fair value, ending balance 21,134 [2],[12] 21,353 [1],[7],[19]  
Investment, Identifier [Axis]: PADI Holdco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29] 20,130    
Investments, at fair value, ending balance 20,997 [2],[11],[31] 20,130 [1],[6],[9],[29]  
Investment, Identifier [Axis]: PADI Holdco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 823    
Investments, at fair value, ending balance 7,496 [2],[11],[31] 823 [1],[6]  
Investment, Identifier [Axis]: PADI Holdco, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 170    
Investments, at fair value, ending balance 814 [2],[11] 170 [1],[6]  
Investment, Identifier [Axis]: PADI Holdco, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 214    
Investments, at fair value, ending balance 1,125 [2],[11] 214 [1],[6]  
Investment, Identifier [Axis]: PADI Holdco, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 168    
Investment, Identifier [Axis]: PAS Parent Inc. One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[10],[17],[18],[19] 54,960    
Investments, at fair value, ending balance [1],[6],[7],[10],[17],[18],[19]   54,960  
Investment, Identifier [Axis]: PAS Parent Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,914    
Investment, Identifier [Axis]: PAS Parent Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,618    
Investments, at fair value, ending balance [1],[6]   1,618  
Investment, Identifier [Axis]: PAS Parent Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (39)    
Investments, at fair value, ending balance [1],[6],[13]   (39)  
Investment, Identifier [Axis]: PAS Parent Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 57,666    
Investment, Identifier [Axis]: PAS Parent Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 124    
Investments, at fair value, ending balance (10) [2],[11] 124 [1],[6]  
Investment, Identifier [Axis]: PAS Parent Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,608    
Investments, at fair value, ending balance (49) [2],[11] 2,608 [1],[6]  
Investment, Identifier [Axis]: PAS Parent Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 299    
Investments, at fair value, ending balance 342 [2],[11] 299 [1],[6]  
Investment, Identifier [Axis]: PB Group Holdings, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 886    
Investments, at fair value, ending balance [1],[6]   886  
Investment, Identifier [Axis]: PB Group Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 36,544    
Investments, at fair value, ending balance 37,581 [2],[11],[16] 36,544 [1],[6],[15]  
Investment, Identifier [Axis]: PB Group Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (22)    
Investments, at fair value, ending balance 513 [2],[11] (22) [1],[6],[13]  
Investment, Identifier [Axis]: PB Group Holdings, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 946    
Investment, Identifier [Axis]: PDI TA Holdings, Inc, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 5,660    
Investments, at fair value, ending balance [1],[6]   5,660  
Investment, Identifier [Axis]: PDI TA Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,143    
Investments, at fair value, ending balance 11,551 [2],[11] 1,143 [1],[6],[10]  
Investment, Identifier [Axis]: PDI TA Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 35 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: PDI TA Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 6,591    
Investment, Identifier [Axis]: PDQ Intermediate, Inc., Subordinated debt      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 114    
Investments, at fair value, ending balance 132 [2],[11],[16] 114 [1],[6],[15]  
Investment, Identifier [Axis]: PHM NL SP Bidco B.V., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[29],[34] 46,023    
Investments, at fair value, ending balance 52,870 [2],[11],[16],[26],[30],[31] 46,023 [1],[6],[9],[15],[29],[34]  
Investment, Identifier [Axis]: PHM NL SP Bidco B.V., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[34] 17,994    
Investments, at fair value, ending balance 19,576 [2],[11],[16],[26],[30] 17,994 [1],[6],[9],[15],[34]  
Investment, Identifier [Axis]: PHM NL SP Bidco B.V., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[29],[34] 10,348    
Investments, at fair value, ending balance 11,312 [2],[11],[16],[26],[30],[31] 10,348 [1],[6],[9],[15],[29],[34]  
Investment, Identifier [Axis]: PHM NL SP Bidco B.V., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[29],[34] 4,807    
Investments, at fair value, ending balance 5,503 [2],[11],[16],[26],[30],[31] 4,807 [1],[6],[9],[15],[29],[34]  
Investment, Identifier [Axis]: PING Identity Holding Corp., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 15,145    
Investments, at fair value, ending balance 14,993 [2],[11] 15,145 [1],[6],[10]  
Investment, Identifier [Axis]: PING Identity Holding Corp., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: POY Holdings, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 966    
Investments, at fair value, ending balance [1],[6]   966  
Investment, Identifier [Axis]: POY Holdings, LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 483    
Investment, Identifier [Axis]: POY Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[18],[19],[20] 28,489    
Investments, at fair value, ending balance 27,914 [2],[11],[12] 28,489 [1],[6],[10],[18],[19],[20]  
Investment, Identifier [Axis]: POY Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 3,703    
Investments, at fair value, ending balance 3,629 [2],[11],[12] 3,703 [1],[6],[10]  
Investment, Identifier [Axis]: POY Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 1,311    
Investments, at fair value, ending balance 1,284 [2],[11],[12] 1,311 [1],[6],[17]  
Investment, Identifier [Axis]: POY Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 873    
Investments, at fair value, ending balance 856 [2],[11] 873 [1],[6]  
Investment, Identifier [Axis]: POY Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 651    
Investments, at fair value, ending balance 639 [2],[11] 651 [1],[6]  
Investment, Identifier [Axis]: POY Holdings, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 291    
Investments, at fair value, ending balance 285 [2],[11] 291 [1],[6]  
Investment, Identifier [Axis]: POY Holdings, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 31    
Investments, at fair value, ending balance 229 [2],[11] 31 [1],[6]  
Investment, Identifier [Axis]: POY Holdings, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: POY Holdings, LLC, One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[12] 2,239    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17],[19] 14,189    
Investments, at fair value, ending balance 14,046 [2],[11],[12] 14,189 [1],[6],[10],[17],[19]  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 9,108    
Investments, at fair value, ending balance 10,522 [2],[11],[16] 9,108 [1],[6],[15]  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,799    
Investments, at fair value, ending balance 5,488 [2],[11] 1,799 [1],[6],[15]  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 416    
Investments, at fair value, ending balance 2,063 [2],[11],[16] 416 [1],[6],[15]  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 76    
Investments, at fair value, ending balance 477 [2],[11],[16] 76 [1],[6],[15]  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 75    
Investments, at fair value, ending balance 86 [2],[11],[16] 75 [1],[6],[15]  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 87 [2],[11],[16] 0 [1],[6],[13]  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (70)    
Investments, at fair value, ending balance 0 [2],[11],[14] (70) [1],[6],[13]  
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 771    
Investments, at fair value, ending balance [1],[6]   771  
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 34,892    
Investments, at fair value, ending balance 33,857 [2],[11],[12] 34,892 [1],[6],[17]  
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., One stop 1(1)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 186    
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4,292    
Investments, at fair value, ending balance 11,742 [2],[12] 4,292 [1],[6]  
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., One stop 2(1)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (3)    
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance (2) [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 52    
Investments, at fair value, ending balance (1) [2],[11],[14] 52 [1],[6]  
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 6,400    
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 672    
Investment, Identifier [Axis]: PSC Parent, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 5,505    
Investments, at fair value, ending balance [1],[6],[17]   5,505  
Investment, Identifier [Axis]: PSC Parent, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 377    
Investments, at fair value, ending balance [1],[6]   377  
Investment, Identifier [Axis]: PSC Parent, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: PSC Parent, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 917    
Investments, at fair value, ending balance [1],[6]   917  
Investment, Identifier [Axis]: PSC Parent, Inc.., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 5,451    
Investment, Identifier [Axis]: PSC Parent, Inc.., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 231    
Investment, Identifier [Axis]: PSC Parent, Inc.., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 604    
Investment, Identifier [Axis]: PSC Parent, Inc.., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 909    
Investment, Identifier [Axis]: PT Intermediate Holdings III, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,879    
Investments, at fair value, ending balance [1],[6]   1,879  
Investment, Identifier [Axis]: PT Intermediate Holdings III, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 12,234    
Investments, at fair value, ending balance [1],[6],[10],[15]   12,234  
Investment, Identifier [Axis]: PT Intermediate Holdings III, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: PT Intermediate Holdings III, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,918    
Investment, Identifier [Axis]: PT Intermediate Holdings III, LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 21,326    
Investment, Identifier [Axis]: PT Intermediate Holdings III, LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Packaging Coordinators Midco, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 450    
Investment, Identifier [Axis]: Packaging Coordinators Midco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 5,258    
Investment, Identifier [Axis]: Packaging Coordinators Midco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Packaging Coordinators Midco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Packaging Coordinators Midco, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Packaging Coordinators Midco, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Packaging Coordinators Midco, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Packaging Coordinators Midco, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Packaging Coordinators Midco, Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Panzura, LLC, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Panzura, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Panzura, LLC, One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 98    
Investments, at fair value, ending balance 120 [2],[11],[16] 98 [1],[6],[15]  
Investment, Identifier [Axis]: Pareto Health Intermediate Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 22,115    
Investments, at fair value, ending balance 74,088 [2],[11],[12] 22,115 [1],[6],[18]  
Investment, Identifier [Axis]: Pareto Health Intermediate Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 7,372    
Investments, at fair value, ending balance 0 [2],[11],[14] 7,372 [1],[6]  
Investment, Identifier [Axis]: Pareto Health Intermediate Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Patriot Acquireco, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 450    
Investment, Identifier [Axis]: Patriot Acquireco, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 25    
Investment, Identifier [Axis]: Patriot Acquireco, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,809    
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[18] 15,368    
Investments, at fair value, ending balance 72,028 [2],[11] 15,368 [1],[6],[10],[18]  
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 3,141    
Investments, at fair value, ending balance 9,823 [2],[11] 3,141 [1],[6]  
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 35    
Investments, at fair value, ending balance 3,047 [2],[11] 35 [1],[6]  
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,447    
Investments, at fair value, ending balance 0 [2],[11],[14] 1,447 [1],[6]  
Investment, Identifier [Axis]: People Corporation, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[10],[29] 24,688    
Investments, at fair value, ending balance 23,797 [2],[11],[25],[26],[31] 24,688 [1],[6],[8],[9],[10],[29]  
Investment, Identifier [Axis]: People Corporation, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 20,716    
Investments, at fair value, ending balance 19,976 [2],[11],[25],[26],[31] 20,716 [1],[6],[8],[9],[29]  
Investment, Identifier [Axis]: People Corporation, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 8,101    
Investments, at fair value, ending balance 9,771 [2],[11],[25],[26],[31] 8,101 [1],[6],[8],[9],[29]  
Investment, Identifier [Axis]: People Corporation, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 6,802    
Investments, at fair value, ending balance 7,811 [2],[11],[25],[26],[31] 6,802 [1],[6],[8],[9],[29]  
Investment, Identifier [Axis]: People Corporation, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[29] 71    
Investments, at fair value, ending balance 258 [2],[11],[25],[26],[31] 71 [1],[6],[8],[9],[29]  
Investment, Identifier [Axis]: People Corporation, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26],[31] 6,619    
Investment, Identifier [Axis]: Personify, Inc., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,241    
Investment, Identifier [Axis]: Personify, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,303    
Investments, at fair value, ending balance [1],[6]   2,303  
Investment, Identifier [Axis]: Personify, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[17],[19] 13,866    
Investments, at fair value, ending balance 16,676 [2],[11] 13,866 [1],[6],[7],[17],[19]  
Investment, Identifier [Axis]: Personify, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[18],[19] 9,810    
Investments, at fair value, ending balance 12,337 [2],[12] 9,810 [1],[18],[19]  
Investment, Identifier [Axis]: Personify, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 8,751 [2],[11],[12] 0 [1],[6]  
Investment, Identifier [Axis]: Personify, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Pet Holdings ULC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[8],[9],[24] 657    
Investments, at fair value, ending balance [1],[6],[8],[9],[24]   657  
Investment, Identifier [Axis]: PetVet Care Centers LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 4,503    
Investments, at fair value, ending balance 4,317 [2],[11],[12] 4,503 [1],[6],[17]  
Investment, Identifier [Axis]: PetVet Care Centers LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (4)    
Investments, at fair value, ending balance (6) [2],[11],[14] (4) [1],[6],[13]  
Investment, Identifier [Axis]: PetVet Care Centers LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Pineapple German Bidco GMBH, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[29],[46] 1,042    
Investments, at fair value, ending balance 15,046 [2],[11],[16],[26],[47] 1,042 [1],[6],[9],[15],[29],[46]  
Investment, Identifier [Axis]: Pineapple German Bidco GMBH, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[29],[46] 247    
Investments, at fair value, ending balance 5,300 [2],[11],[16],[26],[31],[47] 247 [1],[6],[9],[15],[29],[46]  
Investment, Identifier [Axis]: Pineapple German Bidco GMBH, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[29],[46] 72    
Investments, at fair value, ending balance 1,139 [2],[11],[16],[26],[31],[47] 72 [1],[6],[9],[15],[29],[46]  
Investment, Identifier [Axis]: Pineapple German Bidco GMBH, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[31],[47] 353    
Investment, Identifier [Axis]: Pineapple German Bidco GMBH, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[47] 77    
Investment, Identifier [Axis]: Pineapple German Bidco GMBH, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[31],[47] 78    
Investment, Identifier [Axis]: Pineapple German Bidco GMBH, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[31],[47] 0    
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., LLC interest 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 866    
Investments, at fair value, ending balance 621 [2],[11] 866 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., LLC interest 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,036    
Investments, at fair value, ending balance 0 [2],[11] 1,036 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 18,333    
Investments, at fair value, ending balance 17,952 [2],[12] 18,333 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 103    
Investments, at fair value, ending balance 176 [2],[11] 103 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 290    
Investments, at fair value, ending balance 101 [2],[11] 290 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 12,277    
Investments, at fair value, ending balance 12,026 [2],[12] 12,277 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,467    
Investments, at fair value, ending balance 2,418 [2],[11],[12] 2,467 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,383    
Investments, at fair value, ending balance 2,336 [2],[12] 2,383 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,508    
Investments, at fair value, ending balance 1,477 [2],[11],[12] 1,508 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,368    
Investments, at fair value, ending balance 1,340 [2],[11],[12] 1,368 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 680    
Investments, at fair value, ending balance 666 [2],[11] 680 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 533    
Investments, at fair value, ending balance 522 [2],[11] 533 [1],[6]  
Investment, Identifier [Axis]: Pinnacle Treatment Centers, Inc., One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 180    
Investments, at fair value, ending balance 502 [2],[11] 180 [1],[6]  
Investment, Identifier [Axis]: PlanSource Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 14,091    
Investments, at fair value, ending balance 14,234 [2],[11],[12] 14,091 [1],[6],[10]  
Investment, Identifier [Axis]: PlanSource Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,391    
Investments, at fair value, ending balance 2,416 [2],[11] 2,391 [1],[6],[10]  
Investment, Identifier [Axis]: PlanSource Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 689    
Investments, at fair value, ending balance 695 [2],[11] 689 [1],[6]  
Investment, Identifier [Axis]: PlanSource Holdings, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (3)    
Investments, at fair value, ending balance 0 [2],[11] (3) [1],[6],[13]  
Investment, Identifier [Axis]: Plasma Buyer LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 7,795    
Investments, at fair value, ending balance 6,778 [2],[11] 7,795 [1],[6],[10]  
Investment, Identifier [Axis]: Plasma Buyer LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 173    
Investments, at fair value, ending balance 256 [2],[11] 173 [1],[6]  
Investment, Identifier [Axis]: Plasma Buyer LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 60    
Investments, at fair value, ending balance 94 [2],[11] 60 [1],[6]  
Investment, Identifier [Axis]: Pluralsight, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 3,512    
Investment, Identifier [Axis]: Pluralsight, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 3,663    
Investments, at fair value, ending balance [1],[6]   3,663  
Investment, Identifier [Axis]: Pluralsight, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 5,725    
Investments, at fair value, ending balance 6,671 [2],[11],[16] 5,725 [1],[6],[15]  
Investment, Identifier [Axis]: Pluralsight, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 3,856    
Investments, at fair value, ending balance 3,985 [2],[11],[16] 3,856 [1],[6],[15]  
Investment, Identifier [Axis]: Pluralsight, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,928    
Investments, at fair value, ending balance 1,993 [2],[11],[16] 1,928 [1],[6],[15]  
Investment, Identifier [Axis]: Pluralsight, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (30)    
Investments, at fair value, ending balance (10) [2],[11],[14] (30) [1],[6],[13]  
Investment, Identifier [Axis]: Pluralsight, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (75)    
Investments, at fair value, ending balance (25) [2],[11],[14] (75) [1],[6],[13]  
Investment, Identifier [Axis]: Polk Acquisition Corp., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 30    
Investment, Identifier [Axis]: Polk Acquisition Corp., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[15],[19] 17,297    
Investments, at fair value, ending balance [1],[6],[7],[15],[19]   17,297  
Investment, Identifier [Axis]: Polk Acquisition Corp., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 102    
Investments, at fair value, ending balance [1],[6],[15]   102  
Investment, Identifier [Axis]: Polk Acquisition Corp., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 108    
Investments, at fair value, ending balance [1],[6],[15]   108  
Investment, Identifier [Axis]: Power Grid Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,425    
Investments, at fair value, ending balance 1,481 [2],[11] 1,425 [1],[6],[10]  
Investment, Identifier [Axis]: Power Grid Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 17 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Premise Health Holding Corp., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,391    
Investments, at fair value, ending balance 1,377 [2],[11] 1,391 [1],[6],[10]  
Investment, Identifier [Axis]: Premise Health Holding Corp., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: ProcessUnity Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 6,014    
Investments, at fair value, ending balance 6,014 [2],[11] 6,014 [1],[6],[20]  
Investment, Identifier [Axis]: ProcessUnity Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,864    
Investments, at fair value, ending balance 4,240 [2],[11] 2,864 [1],[6],[10]  
Investment, Identifier [Axis]: ProcessUnity Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,203    
Investments, at fair value, ending balance 2,864 [2],[11] 1,203 [1],[6]  
Investment, Identifier [Axis]: ProcessUnity Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 90    
Investments, at fair value, ending balance 1,203 [2],[11] 90 [1],[6]  
Investment, Identifier [Axis]: ProcessUnity Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 108    
Investment, Identifier [Axis]: Procure Acquireco, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,150    
Investments, at fair value, ending balance 1,199 [2],[11] 1,150 [1],[6]  
Investment, Identifier [Axis]: Procure Acquireco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[18],[19] 24,925    
Investments, at fair value, ending balance 24,667 [2],[11],[12] 24,925 [1],[6],[17],[18],[19]  
Investment, Identifier [Axis]: Procure Acquireco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,145    
Investments, at fair value, ending balance 1,135 [2],[11] 1,145 [1],[6]  
Investment, Identifier [Axis]: Procure Acquireco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Procure Acquireco, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Procure Acquireco, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 3,462    
Investment, Identifier [Axis]: Profile Products LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 8,600    
Investments, at fair value, ending balance [1],[6],[10]   8,600  
Investment, Identifier [Axis]: Profile Products LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10] 1,743    
Investments, at fair value, ending balance [1],[6],[9],[10]   1,743  
Investment, Identifier [Axis]: Profile Products LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 68    
Investments, at fair value, ending balance [1],[6]   68  
Investment, Identifier [Axis]: Profile Products LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (4)    
Investments, at fair value, ending balance [1],[6],[13]   (4)  
Investment, Identifier [Axis]: Profile Products LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 8,959    
Investment, Identifier [Axis]: Profile Products LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,816    
Investment, Identifier [Axis]: Profile Products LLC., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 72    
Investment, Identifier [Axis]: Profile Products LLC., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 4    
Investment, Identifier [Axis]: Project Alpha Intermediate Holdings, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 755    
Investments, at fair value, ending balance [1],[6]   755  
Investment, Identifier [Axis]: Project Alpha Intermediate Holdings, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 1,646    
Investments, at fair value, ending balance [1],[6],[24]   1,646  
Investment, Identifier [Axis]: Project Alpha Intermediate Holdings, Inc.^, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,410    
Investment, Identifier [Axis]: Project Nike Purchaser, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 33,529    
Investments, at fair value, ending balance 33,187 [2],[11],[12] 33,529 [1],[6],[18]  
Investment, Identifier [Axis]: Project Nike Purchaser, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 742    
Investments, at fair value, ending balance 735 [2],[11] 742 [1],[6],[10]  
Investment, Identifier [Axis]: Project Nike Purchaser, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 246    
Investments, at fair value, ending balance 194 [2],[11] 246 [1],[6]  
Investment, Identifier [Axis]: Project Power Buyer, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[10],[17],[19] 53,171    
Investments, at fair value, ending balance [1],[6],[7],[10],[17],[19]   53,171  
Investment, Identifier [Axis]: Project Power Buyer, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Provenance Buyer LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[10],[17],[19] 19,756    
Investments, at fair value, ending balance 20,170 [2],[11],[12] 19,756 [1],[6],[7],[10],[17],[19]  
Investment, Identifier [Axis]: Provenance Buyer LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[18],[19] 13,309    
Investments, at fair value, ending balance 13,590 [2],[11],[12] 13,309 [1],[18],[19]  
Investment, Identifier [Axis]: Provenance Buyer LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 112    
Investments, at fair value, ending balance 170 [2],[11] 112 [1],[6]  
Investment, Identifier [Axis]: Purfoods, LLC, LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4,991    
Investments, at fair value, ending balance 5,892 [2],[11] 4,991 [1],[6]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 385    
Investments, at fair value, ending balance [1],[6]   385  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18],[19] 25,098    
Investments, at fair value, ending balance 24,839 [2],[11],[12] 25,098 [1],[6],[18],[19]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 202    
Investments, at fair value, ending balance 200 [2],[11] 202 [1],[6],[10]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 79    
Investments, at fair value, ending balance 78 [2],[11] 79 [1],[6],[10]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,595    
Investments, at fair value, ending balance 2,569 [2],[11],[12] 2,595 [1],[6]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,170    
Investments, at fair value, ending balance 2,147 [2],[11],[12] 2,170 [1],[6],[10]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,192    
Investments, at fair value, ending balance 1,180 [2],[11],[12] 1,192 [1],[6],[10]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,092    
Investments, at fair value, ending balance 1,081 [2],[11],[12] 1,092 [1],[6]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 738    
Investments, at fair value, ending balance 729 [2],[11] 738 [1],[6],[10]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 245    
Investments, at fair value, ending balance 243 [2],[11] 245 [1],[6],[10]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 216    
Investments, at fair value, ending balance 213 [2],[11] 216 [1],[6],[10]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 202    
Investments, at fair value, ending balance 200 [2],[11] 202 [1],[6],[10]  
Investment, Identifier [Axis]: Pyramid Healthcare Acquisition Corp., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 380    
Investment, Identifier [Axis]: QAD, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: QAD, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,004    
Investment, Identifier [Axis]: QAD, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 279    
Investment, Identifier [Axis]: QAD, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[18] 43,261    
Investments, at fair value, ending balance 42,819 [2],[11],[12] 43,261 [1],[6],[10],[18]  
Investment, Identifier [Axis]: QAD, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: QAD, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 1,147    
Investments, at fair value, ending balance [1],[6],[24]   1,147  
Investment, Identifier [Axis]: QF Holdings, Inc., One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 931    
Investments, at fair value, ending balance 924 [2],[11] 931 [1],[6]  
Investment, Identifier [Axis]: QSR Acquisition Co., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,525    
Investment, Identifier [Axis]: QSR Acquisition Co., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: QSR Acquisition Co., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Quant Buyer, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 7,406    
Investments, at fair value, ending balance 7,332 [2],[11],[12] 7,406 [1],[6],[10]  
Investment, Identifier [Axis]: Quant Buyer, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 4,360    
Investments, at fair value, ending balance 4,428 [2],[11],[12] 4,360 [1],[6],[10]  
Investment, Identifier [Axis]: Quant Buyer, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 3,015    
Investments, at fair value, ending balance 4,316 [2],[11],[12] 3,015 [1],[6],[17]  
Investment, Identifier [Axis]: Quant Buyer, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 230 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Quant Buyer, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Quick Quack Car Wash Holdings, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 226    
Investments, at fair value, ending balance 1,421 [2],[11] 226 [1],[6]  
Investment, Identifier [Axis]: Quick Quack Car Wash Holdings, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,143    
Investments, at fair value, ending balance [1],[6]   1,143  
Investment, Identifier [Axis]: Quick Quack Car Wash Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 3,608    
Investments, at fair value, ending balance 4,808 [2],[11] 3,608 [1],[6]  
Investment, Identifier [Axis]: Quick Quack Car Wash Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 140    
Investments, at fair value, ending balance 270 [2],[11] 140 [1],[6]  
Investment, Identifier [Axis]: Quick Quack Car Wash Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Quick Quack Car Wash Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 160    
Investment, Identifier [Axis]: Quick Quack Car Wash Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 20    
Investment, Identifier [Axis]: Quick Quack Car Wash Holdings, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 270    
Investment, Identifier [Axis]: RJW Group Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 45,950    
Investment, Identifier [Axis]: RJW Group Holdings, Inc., One stop 1(1)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,693    
Investment, Identifier [Axis]: RJW Group Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,897    
Investment, Identifier [Axis]: RJW Group Holdings, Inc., One stop 2(1)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (3)    
Investment, Identifier [Axis]: RPL Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 6,052    
Investments, at fair value, ending balance 6,084 [2],[11],[26],[30],[31] 6,052 [1],[6],[9],[10],[28],[29]  
Investment, Identifier [Axis]: RPL Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 27,932    
Investments, at fair value, ending balance 28,080 [2],[11],[26],[30],[31] 27,932 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: RPL Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 12,173    
Investments, at fair value, ending balance 11,640 [2],[11],[26],[30],[31] 12,173 [1],[6],[9],[10],[28],[29]  
Investment, Identifier [Axis]: RPL Bidco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 2,955    
Investments, at fair value, ending balance 2,826 [2],[11],[26],[30],[31] 2,955 [1],[6],[9],[10],[28],[29]  
Investment, Identifier [Axis]: RPL Bidco Limited, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 0    
Investments, at fair value, ending balance 0 [2],[11],[26],[30],[31] 0 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: RTI Surgical, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: RTI Surgical, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,658    
Investment, Identifier [Axis]: RW AM Holdco LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18],[19] 24,523    
Investments, at fair value, ending balance 18,182 [2],[11] 24,523 [1],[6],[18],[19]  
Investment, Identifier [Axis]: RW AM Holdco LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (22)    
Investments, at fair value, ending balance (46) [2],[11],[14] (22) [1],[6],[13]  
Investment, Identifier [Axis]: Radiance Borrower, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 21,558    
Investments, at fair value, ending balance 21,950 [2],[11],[16] 21,558 [1],[6],[15]  
Investment, Identifier [Axis]: Radiance Borrower, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 410    
Investments, at fair value, ending balance 205 [2],[11] 410 [1],[6]  
Investment, Identifier [Axis]: Radiology Partners, Inc., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 340    
Investments, at fair value, ending balance 374 [2],[11] 340 [1],[6]  
Investment, Identifier [Axis]: Radiology Partners, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 86    
Investments, at fair value, ending balance 94 [2],[11] 86 [1],[6]  
Investment, Identifier [Axis]: Radwell Parent, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 465    
Investments, at fair value, ending balance [1],[6]   465  
Investment, Identifier [Axis]: Radwell Parent, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[19],[20] 33,947    
Investments, at fair value, ending balance [1],[6],[19],[20]   33,947  
Investment, Identifier [Axis]: Radwell Parent, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[18] 32,083    
Investments, at fair value, ending balance [1],[6],[10],[18]   32,083  
Investment, Identifier [Axis]: Radwell Parent, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 235    
Investments, at fair value, ending balance [1],[6]   235  
Investment, Identifier [Axis]: Radwell Parent, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 540    
Investments, at fair value, ending balance [1],[6]   540  
Investment, Identifier [Axis]: Radwell Parent, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 467    
Investment, Identifier [Axis]: Radwell Parent, LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 33,940    
Investment, Identifier [Axis]: Radwell Parent, LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 32,623    
Investment, Identifier [Axis]: Radwell Parent, LLC., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 330    
Investment, Identifier [Axis]: Rainforest Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[28],[29] 19,962    
Investments, at fair value, ending balance 21,404 [2],[11],[16],[26],[30],[31] 19,962 [1],[6],[9],[15],[28],[29]  
Investment, Identifier [Axis]: Rainforest Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[28] 3,526    
Investments, at fair value, ending balance 3,762 [2],[11],[16],[26],[30] 3,526 [1],[6],[9],[15],[28]  
Investment, Identifier [Axis]: Rainforest Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[28],[29] 2,159    
Investments, at fair value, ending balance 3,580 [2],[11],[16],[26],[30],[31] 2,159 [1],[6],[9],[15],[28],[29]  
Investment, Identifier [Axis]: Rainforest Bidco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[28],[29] 1,467    
Investments, at fair value, ending balance 1,573 [2],[11],[16],[26],[30],[31] 1,467 [1],[6],[9],[15],[28],[29]  
Investment, Identifier [Axis]: Rainforest Bidco Limited, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[30] 1,002    
Investment, Identifier [Axis]: Rainforest Bidco Limited, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[30],[31] 0    
Investment, Identifier [Axis]: Rainforest Bidco Limited, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[30] 700    
Investment, Identifier [Axis]: Reaction Biology Corporation      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 0    
Gross additions 10,426    
Gross reductions (1,684)    
Net change in unrealized appreciation (depreciation) (1,483)    
Net realized gain (loss) 0    
Investments, at fair value, ending balance 7,259 0  
Interest, dividend and fee income 182    
Investment, Identifier [Axis]: Reaction Biology Corporation, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4    
Investments, at fair value, ending balance [1],[6]   4  
Investment, Identifier [Axis]: Reaction Biology Corporation, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[19],[21] 6,622    
Investments, at fair value, ending balance 2,777 [2],[11],[16],[23] 6,622 [1],[6],[15],[19],[21]  
Investment, Identifier [Axis]: Reaction Biology Corporation, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[21] 2,203    
Investments, at fair value, ending balance 839 [2],[11],[16],[23] 2,203 [1],[6],[15],[21]  
Investment, Identifier [Axis]: Reaction Biology Corporation, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[21] 1,465    
Investments, at fair value, ending balance [1],[6],[15],[21]   1,465  
Investment, Identifier [Axis]: Reaction Biology Corporation, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[21] 236    
Investments, at fair value, ending balance [1],[6],[15],[21]   236  
Investment, Identifier [Axis]: Recordxtechnologies, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10],[17],[19] 18,874    
Investments, at fair value, ending balance [1],[10],[17],[19]   18,874  
Investment, Identifier [Axis]: Recordxtechnologies, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,769    
Investments, at fair value, ending balance [1],[6]   1,769  
Investment, Identifier [Axis]: Recordxtechnologies, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2    
Investments, at fair value, ending balance [1],[6]   2  
Investment, Identifier [Axis]: Recordxtechnologies, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 894    
Investments, at fair value, ending balance [1],[6],[10]   894  
Investment, Identifier [Axis]: Recordxtechnologies, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 12,553    
Investments, at fair value, ending balance [1],[6]   12,553  
Investment, Identifier [Axis]: RegEd Aquireco, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 37    
Investment, Identifier [Axis]: RegEd Aquireco, LLC, LP interest 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 163    
Investments, at fair value, ending balance 161 [2],[11] 163 [1],[6]  
Investment, Identifier [Axis]: RegEd Aquireco, LLC, LP interest 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: RegEd Aquireco, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 32    
Investments, at fair value, ending balance [1],[6]   32  
Investment, Identifier [Axis]: ReliaQuest Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 11,710    
Investments, at fair value, ending balance 12,133 [2],[11],[16] 11,710 [1],[6],[10],[15]  
Investment, Identifier [Axis]: ReliaQuest Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: ReliaQuest Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: ReliaQuest Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 28,895    
Investment, Identifier [Axis]: Revalize, Inc., LP units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 8,334    
Investment, Identifier [Axis]: Revalize, Inc., LP units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 3,171    
Investment, Identifier [Axis]: Revalize, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[20] 19,279    
Investments, at fair value, ending balance 17,962 [2],[11],[16] 19,279 [1],[6],[17],[20]  
Investment, Identifier [Axis]: Revalize, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 11,284    
Investments, at fair value, ending balance 10,513 [2],[11],[16] 11,284 [1],[6],[20]  
Investment, Identifier [Axis]: Revalize, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 5,595    
Investments, at fair value, ending balance 5,212 [2],[11],[16] 5,595 [1],[6],[20]  
Investment, Identifier [Axis]: Revalize, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 3,370    
Investments, at fair value, ending balance 3,140 [2],[11],[16] 3,370 [1],[6],[20]  
Investment, Identifier [Axis]: Revalize, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,294    
Investments, at fair value, ending balance 2,137 [2],[11],[16] 2,294 [1],[6],[10]  
Investment, Identifier [Axis]: Revalize, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,253    
Investments, at fair value, ending balance 2,099 [2],[11],[16] 2,253 [1],[6],[10]  
Investment, Identifier [Axis]: Revalize, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 219    
Investments, at fair value, ending balance 201 [2],[11],[16] 219 [1],[6]  
Investment, Identifier [Axis]: Revalize, Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 224    
Investments, at fair value, ending balance 242 [2],[11],[16] 224 [1],[6]  
Investment, Identifier [Axis]: Revalize, Inc., Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 30,067    
Investments, at fair value, ending balance 21,278 [2],[11] 30,067 [1],[6]  
Investment, Identifier [Axis]: Revalize, Inc., Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 18,046    
Investments, at fair value, ending balance 12,771 [2],[11] 18,046 [1],[6]  
Investment, Identifier [Axis]: Revalize, Inc., Preferred stock 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 11,768    
Investments, at fair value, ending balance [1],[6]   11,768  
Investment, Identifier [Axis]: Revalize, Inc., Preferred stock 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 4,481    
Investments, at fair value, ending balance [1],[6]   4,481  
Investment, Identifier [Axis]: Riskonnect Parent, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 61    
Investment, Identifier [Axis]: Riskonnect Parent, LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,513    
Investments, at fair value, ending balance [1],[6]   1,513  
Investment, Identifier [Axis]: Riskonnect Parent, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 1,074    
Investment, Identifier [Axis]: Riskonnect Parent, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[10] 45,407    
Investments, at fair value, ending balance 44,717 [2],[11],[12] 45,407 [1],[6],[7],[10]  
Investment, Identifier [Axis]: Riskonnect Parent, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,131    
Investments, at fair value, ending balance 2,099 [2],[11] 2,131 [1],[6]  
Investment, Identifier [Axis]: Riskonnect Parent, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 815    
Investments, at fair value, ending balance 807 [2],[11] 815 [1],[6],[10]  
Investment, Identifier [Axis]: Riskonnect Parent, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 573    
Investments, at fair value, ending balance 567 [2],[11] 573 [1],[6]  
Investment, Identifier [Axis]: Riskonnect Parent, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (4)    
Investments, at fair value, ending balance 68 [2],[11] (4) [1],[6],[13]  
Investment, Identifier [Axis]: Riskonnect Parent, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (10)    
Investments, at fair value, ending balance (10) [2],[11],[14] (10) [1],[6],[13]  
Investment, Identifier [Axis]: Riskonnect Parent, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 36,658    
Investment, Identifier [Axis]: Riskonnect Parent, LLC, Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 31,936    
Investments, at fair value, ending balance 1,393 [2],[11] 31,936 [1],[6],[24]  
Investment, Identifier [Axis]: Riskonnect Parent, LLC, Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 934    
Investments, at fair value, ending balance [1],[6],[24]   934  
Investment, Identifier [Axis]: Riskonnect Parent, LLC, Preferred stock 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 52    
Investments, at fair value, ending balance [1],[6],[24]   52  
Investment, Identifier [Axis]: Rodeo Buyer Company & Absorb Software Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[20] 7,616    
Investments, at fair value, ending balance 13,056 [2],[11],[25],[26] 7,616 [1],[6],[10],[20]  
Investment, Identifier [Axis]: Rodeo Buyer Company & Absorb Software Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 7,616 [2],[11],[25],[26] 0 [1],[6]  
Investment, Identifier [Axis]: Rodeo Buyer Company & Absorb Software Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26] 0    
Investment, Identifier [Axis]: Rodeo Buyer Company & Absorb Software Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26] 2,000    
Investment, Identifier [Axis]: Rokt Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 763    
Investment, Identifier [Axis]: Rooster BidCo Limited, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 1,925    
Investment, Identifier [Axis]: Rooster BidCo Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30],[31] 4,984    
Investment, Identifier [Axis]: Rooster BidCo Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30],[31] 119    
Investment, Identifier [Axis]: Rooster BidCo Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[30],[31] 0    
Investment, Identifier [Axis]: Royal Holdco Corporation, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 5,981    
Investment, Identifier [Axis]: Royal Holdco Corporation, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 212    
Investment, Identifier [Axis]: Royal Holdco Corporation, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 430    
Investment, Identifier [Axis]: Rubio's Restaurants, Inc.      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 0 12,063  
Gross additions   3,759  
Gross reductions   (3,929)  
Net change in unrealized appreciation (depreciation)   6,624  
Net realized gain (loss)   (18,517)  
Investments, at fair value, ending balance   0 12,063
Interest, dividend and fee income   1,187  
Investment, Identifier [Axis]: Ruby Slipper Cafe LLC, The, LLC interest 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 174    
Investments, at fair value, ending balance 85 [2],[11] 174 [1],[6]  
Investment, Identifier [Axis]: Ruby Slipper Cafe LLC, The, LLC interest 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 46    
Investments, at fair value, ending balance 54 [2],[11] 46 [1],[6]  
Investment, Identifier [Axis]: Ruby Slipper Cafe LLC, The, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 49    
Investments, at fair value, ending balance [1],[6]   49  
Investment, Identifier [Axis]: Ruby Slipper Cafe LLC, The, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7] 2,304    
Investments, at fair value, ending balance [1],[6],[7]   2,304  
Investment, Identifier [Axis]: Ruby Slipper Cafe LLC, The, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 515    
Investments, at fair value, ending balance [1],[6]   515  
Investment, Identifier [Axis]: Ruby Slipper Cafe LLC, The, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 340    
Investments, at fair value, ending balance [1],[6]   340  
Investment, Identifier [Axis]: Ruby Slipper Cafe LLC, The, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 190    
Investments, at fair value, ending balance [1],[6]   190  
Investment, Identifier [Axis]: Ruby Slipper Cafe LLC, The, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance [1],[6]   0  
Investment, Identifier [Axis]: Ruby Slipper Cafe LLC, The, Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 53    
Investment, Identifier [Axis]: S.J. Electro Systems, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 24,226    
Investments, at fair value, ending balance 24,226 [2],[12] 24,226 [1],[6]  
Investment, Identifier [Axis]: S.J. Electro Systems, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10],[17],[18] 18,635    
Investments, at fair value, ending balance 18,582 [2],[11],[12] 18,635 [1],[10],[17],[18]  
Investment, Identifier [Axis]: S.J. Electro Systems, LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,176    
Investments, at fair value, ending balance 1,172 [2],[11] 1,176 [1],[6],[10]  
Investment, Identifier [Axis]: S.J. Electro Systems, LLC, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (63)    
Investments, at fair value, ending balance 0 [2],[11],[14] (63) [1],[6],[13]  
Investment, Identifier [Axis]: S.J. Electro Systems, LLC, Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: S.J. Electro Systems, LLC, Senior secured 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 180    
Investment, Identifier [Axis]: S.J. Electro Systems, LLC, Senior secured 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 240    
Investment, Identifier [Axis]: SC Landco Parent, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 260    
Investments, at fair value, ending balance 266 [2],[11] 260 [1],[6]  
Investment, Identifier [Axis]: SDC Holdco, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 21,737    
Investments, at fair value, ending balance (1) [2],[11],[14] 21,737 [1],[6]  
Investment, Identifier [Axis]: SDC Holdco, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 192    
Investments, at fair value, ending balance 1,779 [2],[11] 192 [1],[6]  
Investment, Identifier [Axis]: SDC Holdco, LLC, Second lien      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 3,340    
Investments, at fair value, ending balance [1],[6],[15]   3,340  
Investment, Identifier [Axis]: SPF Borrower LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 36,653    
Gross additions 620    
Gross reductions (328)    
Net change in unrealized appreciation (depreciation) 524    
Net realized gain (loss) 0    
Investments, at fair value, ending balance 37,469 36,653  
Interest, dividend and fee income 2,994    
Investment, Identifier [Axis]: SPF Borrower LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[32],[33] 12,129    
Investments, at fair value, ending balance [1],[3],[6],[32],[33]   12,129  
Investment, Identifier [Axis]: SPF Borrower LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15] 16,191    
Investments, at fair value, ending balance 16,191 [2],[11],[16],[23] 16,191 [1],[3],[6],[15]  
Investment, Identifier [Axis]: SPF Borrower LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[15] 8,333    
Investments, at fair value, ending balance 8,625 [2],[11],[16],[23] 8,333 [1],[3],[6],[15]  
Investment, Identifier [Axis]: SPF Borrower LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6] 0    
Investments, at fair value, ending balance 0 [2],[11],[23] 0 [1],[3],[6]  
Investment, Identifier [Axis]: SPF Borrower LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 12,653    
Investment, Identifier [Axis]: SSRG Holdings, LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 566    
Investments, at fair value, ending balance [1],[6],[24]   566  
Investment, Identifier [Axis]: SSRG Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 12,470    
Investments, at fair value, ending balance 12,346 [2],[12] 12,470 [1],[6]  
Investment, Identifier [Axis]: SSRG Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[18] 7,744    
Investments, at fair value, ending balance 7,664 [2],[11],[12] 7,744 [1],[6],[17],[18]  
Investment, Identifier [Axis]: SSRG Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 804    
Investments, at fair value, ending balance 895 [2],[11] 804 [1],[6]  
Investment, Identifier [Axis]: SSRG Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 611    
Investments, at fair value, ending balance 605 [2],[11] 611 [1],[6],[10]  
Investment, Identifier [Axis]: SSRG Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (2)    
Investment, Identifier [Axis]: SSRG Holdings, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 674    
Investment, Identifier [Axis]: SSRG Holdings, LLC, Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 515    
Investment, Identifier [Axis]: Sage Dental Management, LLC, LLC units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 617    
Investments, at fair value, ending balance 657 [2],[11] 617 [1],[6]  
Investment, Identifier [Axis]: Sage Dental Management, LLC, LLC units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Saguaro Buyer, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 266    
Investment, Identifier [Axis]: Saguaro Buyer, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 6    
Investment, Identifier [Axis]: Saguaro Buyer, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 400    
Investment, Identifier [Axis]: Saguaro Buyer, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Saguaro Buyer, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 11    
Investment, Identifier [Axis]: SailPoint Technologies Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 14,654    
Investments, at fair value, ending balance [1],[6],[20]   14,654  
Investment, Identifier [Axis]: SailPoint Technologies Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: Salisbury House, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 32    
Investment, Identifier [Axis]: Salisbury House, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (3)    
Investment, Identifier [Axis]: Salisbury House, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,483    
Investment, Identifier [Axis]: Salon Lofts Group, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 112    
Investments, at fair value, ending balance [1],[6]   112  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 111    
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Second lien 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 3,045    
Investments, at fair value, ending balance 3,505 [2],[11],[16] 3,045 [1],[6],[15]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Second lien 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,615    
Investments, at fair value, ending balance 1,859 [2],[11],[16] 1,615 [1],[6],[15]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Second lien 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 578    
Investments, at fair value, ending balance 1,559 [2],[11],[16] 578 [1],[6],[15]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Second lien 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 786    
Investments, at fair value, ending balance 909 [2],[11],[16] 786 [1],[6],[15]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Second lien 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 150    
Investments, at fair value, ending balance 676 [2],[11],[16] 150 [1],[6],[15]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Second lien 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 304    
Investments, at fair value, ending balance 173 [2],[11],[16] 304 [1],[6],[15]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Second lien 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[16] 21    
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Second lien 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 692    
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,256    
Investments, at fair value, ending balance 5,216 [2],[11] 5,256 [1],[6],[10]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 80    
Investments, at fair value, ending balance 154 [2],[11] 80 [1],[6]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 11      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 112 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 12      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 104 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 13      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 85 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 14      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 170    
Investments, at fair value, ending balance 79 [2],[11] 170 [1],[6]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 15      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 636    
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 16      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 17      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,228    
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 540    
Investments, at fair value, ending balance 536 [2],[11] 540 [1],[6]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 349    
Investments, at fair value, ending balance 498 [2],[11] 349 [1],[6]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 344    
Investments, at fair value, ending balance 350 [2],[11] 344 [1],[6]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 272    
Investments, at fair value, ending balance 341 [2],[11] 272 [1],[6]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 156    
Investments, at fair value, ending balance 575 [2],[11] 156 [1],[6]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 114    
Investments, at fair value, ending balance 270 [2],[11] 114 [1],[6]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 105    
Investments, at fair value, ending balance 249 [2],[11] 105 [1],[6]  
Investment, Identifier [Axis]: Salon Lofts Group, LLC, Senior secured 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 86    
Investments, at fair value, ending balance 168 [2],[11] 86 [1],[6]  
Investment, Identifier [Axis]: Sapphire Bidco Oy, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[53] 50,901    
Investments, at fair value, ending balance 53,648 [2],[11],[26],[31],[52] 50,901 [1],[6],[9],[29],[53]  
Investment, Identifier [Axis]: Sapphire Bidco Oy, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[53] 4,170    
Investments, at fair value, ending balance 4,395 [2],[11],[26],[31],[52] 4,170 [1],[6],[9],[29],[53]  
Investment, Identifier [Axis]: Sapphire Bidco Oy, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[29],[53] 1,537    
Investments, at fair value, ending balance 1,620 [2],[11],[26],[31],[52] 1,537 [1],[6],[9],[10],[29],[53]  
Investment, Identifier [Axis]: Saturn Borrower Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 607    
Investment, Identifier [Axis]: Saturn Borrower Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 267    
Investments, at fair value, ending balance [1],[6]   267  
Investment, Identifier [Axis]: Saturn Borrower Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17] 26,983    
Investments, at fair value, ending balance 27,326 [2],[11],[12] 26,983 [1],[6],[10],[17]  
Investment, Identifier [Axis]: Saturn Borrower Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 434    
Investments, at fair value, ending balance 110 [2],[11] 434 [1],[6]  
Investment, Identifier [Axis]: Severin Acquisition, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 35,377    
Investment, Identifier [Axis]: Severin Acquisition, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (44)    
Investment, Identifier [Axis]: Severin Acquisition, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 1,175    
Investment, Identifier [Axis]: Shoes For Crews Global, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,109    
Investments, at fair value, ending balance 1,366 [2],[11] 1,109 [1],[6]  
Investment, Identifier [Axis]: Shoes For Crews Global, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,302    
Investments, at fair value, ending balance 1,289 [2],[11] 1,302 [1],[6]  
Investment, Identifier [Axis]: Shoes For Crews Global, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 688    
Investments, at fair value, ending balance 756 [2],[11],[16] 688 [1],[6],[15]  
Investment, Identifier [Axis]: Shoes For Crews Global, LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 421    
Investments, at fair value, ending balance 417 [2],[11] 421 [1],[6]  
Investment, Identifier [Axis]: Shoes For Crews Global, LLC, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Shout! Factory, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,778    
Investment, Identifier [Axis]: Shout! Factory, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 37    
Investment, Identifier [Axis]: Sloan Company, Inc.      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 36,653 0  
Gross additions   34,008  
Gross reductions   (136)  
Net change in unrealized appreciation (depreciation)   2,781  
Net realized gain (loss)   0  
Investments, at fair value, ending balance   36,653 0
Interest, dividend and fee income   2,112  
Investment, Identifier [Axis]: Smart Energy Systems, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 6,294    
Investment, Identifier [Axis]: Smart Energy Systems, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 693    
Investment, Identifier [Axis]: SnapLogic, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 517    
Investment, Identifier [Axis]: SnapLogic, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,707    
Investments, at fair value, ending balance [1],[6]   1,707  
Investment, Identifier [Axis]: SnapLogic, Inc., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 439    
Investments, at fair value, ending balance 2,007 [2],[11] 439 [1],[6]  
Investment, Identifier [Axis]: Sonatype, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 55,697    
Investments, at fair value, ending balance 69,460 [2],[11] 55,697 [1],[6],[10]  
Investment, Identifier [Axis]: Sonatype, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 13,763    
Investments, at fair value, ending balance 0 [2],[11] 13,763 [1],[6],[20]  
Investment, Identifier [Axis]: Sonatype, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 5,022    
Investments, at fair value, ending balance [1],[6]   5,022  
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, LLC units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 52    
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, LLC units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 8    
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, LLC units 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1    
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, LP interest 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 70    
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, LP interest 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 4    
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 442    
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 7,200    
Investments, at fair value, ending balance 5,319 [2],[11],[27] 7,200 [1],[6],[24]  
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 1,360    
Investments, at fair value, ending balance 845 [2],[11] 1,360 [1],[6],[24]  
Investment, Identifier [Axis]: Spark Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 0    
Investment, Identifier [Axis]: Spark Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 0    
Investment, Identifier [Axis]: Spark Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 0    
Investment, Identifier [Axis]: Spark Bidco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30],[31] 0    
Investment, Identifier [Axis]: Spark Bidco Limited, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[15],[28],[29] 36,204    
Investments, at fair value, ending balance 37,100 [2],[11],[16],[26],[30],[31] 36,204 [1],[6],[9],[10],[15],[28],[29]  
Investment, Identifier [Axis]: Spark Bidco Limited, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 5,558    
Investments, at fair value, ending balance 5,587 [2],[11],[26],[30],[31] 5,558 [1],[6],[9],[10],[28],[29]  
Investment, Identifier [Axis]: Spark Bidco Limited, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[28],[29] 4,388    
Investments, at fair value, ending balance 4,497 [2],[11],[16],[26],[30],[31] 4,388 [1],[6],[9],[15],[28],[29]  
Investment, Identifier [Axis]: Spark Bidco Limited, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28] 3,991    
Investments, at fair value, ending balance 3,991 [2],[11],[26],[30] 3,991 [1],[6],[9],[28]  
Investment, Identifier [Axis]: Spark Bidco Limited, Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[28],[29] 3,840    
Investments, at fair value, ending balance 3,935 [2],[11],[16],[26],[30],[31] 3,840 [1],[6],[9],[15],[28],[29]  
Investment, Identifier [Axis]: Spark Bidco Limited, Senior secured 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[28],[29] (8)    
Investments, at fair value, ending balance 116 [2],[11],[26],[30],[31] (8) [1],[6],[9],[13],[28],[29]  
Investment, Identifier [Axis]: Spartan Buyer Acquisition Co., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 132    
Investments, at fair value, ending balance [1],[6]   132  
Investment, Identifier [Axis]: Spartan Buyer Acquisition Co., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 584    
Investments, at fair value, ending balance [1],[6]   584  
Investment, Identifier [Axis]: Spartan Buyer Acquisition Co., LP units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 412    
Investment, Identifier [Axis]: Spartan Buyer Acquisition Co., LP units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 136    
Investment, Identifier [Axis]: Spartan Buyer Acquisition Co., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[10],[15],[19],[20] 44,251    
Investments, at fair value, ending balance 44,261 [2],[11],[12],[16] 44,251 [1],[6],[7],[10],[15],[19],[20]  
Investment, Identifier [Axis]: Spartan Buyer Acquisition Co., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 2,820    
Investments, at fair value, ending balance 2,822 [2],[11],[16] 2,820 [1],[6],[10],[15]  
Investment, Identifier [Axis]: Spartan Buyer Acquisition Co., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13],[15] (2)    
Investments, at fair value, ending balance (2) [2],[11],[14],[16] (2) [1],[6],[13],[15]  
Investment, Identifier [Axis]: Specialty Measurement Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28] 11,146    
Investments, at fair value, ending balance [1],[6],[9],[10],[28]   11,146  
Investment, Identifier [Axis]: Specialty Measurement Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28],[29] 10,428    
Investments, at fair value, ending balance [1],[6],[9],[10],[28],[29]   10,428  
Investment, Identifier [Axis]: Specialty Measurement Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 5,129    
Investments, at fair value, ending balance [1],[6],[9],[28],[29]   5,129  
Investment, Identifier [Axis]: Specialty Measurement Bidco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28] 2,040    
Investments, at fair value, ending balance [1],[6],[9],[10],[28]   2,040  
Investment, Identifier [Axis]: Specialty Measurement Bidco Limited, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28] 3,805    
Investments, at fair value, ending balance [1],[6],[9],[10],[28]   3,805  
Investment, Identifier [Axis]: Specialty Measurement Bidco Limited, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 4,588    
Investments, at fair value, ending balance [1],[6],[9],[28],[29]   4,588  
Investment, Identifier [Axis]: Sphynx UK Bidco, Ltd., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30],[31] 308    
Investment, Identifier [Axis]: Sphynx UK Bidco, Ltd., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30],[31] 302    
Investment, Identifier [Axis]: Sphynx UK Bidco, Ltd., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30],[31] 1,398    
Investment, Identifier [Axis]: Spindrift Beverage Co. Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 7,653    
Investment, Identifier [Axis]: Spindrift Beverage Co. Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Spindrift Beverage Co. Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Stellar Brands, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 7,151    
Investment, Identifier [Axis]: Stellar Brands, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: StrongDM, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,349    
Investment, Identifier [Axis]: Super REGO, LLC, Subordinated debt      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 108    
Investments, at fair value, ending balance 74 [2],[11],[16] 108 [1],[6],[15]  
Investment, Identifier [Axis]: Surewerx Purchaser III, Inc. & Jet Equipment & Tools Ltd., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[17],[18],[20] 29,510    
Investments, at fair value, ending balance 31,751 [2],[11],[12] 29,510 [1],[6],[9],[10],[17],[18],[20]  
Investment, Identifier [Axis]: Surewerx Purchaser III, Inc. & Jet Equipment & Tools Ltd., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[29] 8,039    
Investments, at fair value, ending balance 7,655 [2],[11],[31] 8,039 [1],[6],[9],[10],[29]  
Investment, Identifier [Axis]: Surewerx Purchaser III, Inc. & Jet Equipment & Tools Ltd., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9] 501    
Investments, at fair value, ending balance (33) [2],[11],[14] 501 [1],[6],[9]  
Investment, Identifier [Axis]: Surewerx Purchaser III, Inc. & Jet Equipment & Tools Ltd., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13] 0    
Investments, at fair value, ending balance 230 [2],[11] 0 [1],[6],[9],[13]  
Investment, Identifier [Axis]: Suveto Buyer, LLC, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 534    
Investments, at fair value, ending balance 573 [2],[11] 534 [1],[6]  
Investment, Identifier [Axis]: Suveto Buyer, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 27,639    
Investments, at fair value, ending balance 27,459 [2],[11],[12] 27,639 [1],[6]  
Investment, Identifier [Axis]: Suveto Buyer, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 194    
Investments, at fair value, ending balance 11,180 [2],[11] 194 [1],[6]  
Investment, Identifier [Axis]: Suveto Buyer, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Switchfly LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 7,313    
Gross additions 2,547    
Gross reductions (1,427)    
Net change in unrealized appreciation (depreciation) 349    
Net realized gain (loss) 0    
Investments, at fair value, ending balance 8,782 7,313  
Interest, dividend and fee income 26    
Investment, Identifier [Axis]: Switchfly LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance 7,313 7,254  
Gross additions   6,180  
Gross reductions   (5,378)  
Net change in unrealized appreciation (depreciation)   1,157  
Net realized gain (loss)   (1,900)  
Investments, at fair value, ending balance   7,313 $ 7,254
Interest, dividend and fee income   88  
Investment, Identifier [Axis]: Switchfly LLC, LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[32],[33] 860    
Investments, at fair value, ending balance [1],[3],[6],[32],[33]   860  
Investment, Identifier [Axis]: Switchfly LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[32],[33] 552    
Investments, at fair value, ending balance [1],[3],[6],[32],[33]   552  
Investment, Identifier [Axis]: Switchfly LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[3],[6],[32],[33] 5,375    
Investments, at fair value, ending balance [1],[3],[6],[32],[33]   5,375  
Investment, Identifier [Axis]: Switchfly LLC, Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 486    
Investment, Identifier [Axis]: Switchfly LLC, Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 6,002    
Investment, Identifier [Axis]: Switchfly LLC, Preferred stock 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 643    
Investment, Identifier [Axis]: Symplr Software, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,064    
Investments, at fair value, ending balance 756 [2],[11] 1,064 [1],[6]  
Investment, Identifier [Axis]: Symplr Software, Inc., Common stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 7,498    
Investment, Identifier [Axis]: Symplr Software, Inc., Common stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 2,737    
Investment, Identifier [Axis]: Symplr Software, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 185    
Investments, at fair value, ending balance 20,627 [2],[11],[27] 185 [1],[6]  
Investment, Identifier [Axis]: Symplr Software, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 131    
Investment, Identifier [Axis]: Symplr Software, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[27] 1,601    
Investment, Identifier [Axis]: Symplr Software, Inc., Preferred stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 19,043    
Investments, at fair value, ending balance [1],[6],[24]   19,043  
Investment, Identifier [Axis]: Symplr Software, Inc., Preferred stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 6,675    
Investments, at fair value, ending balance [1],[6],[24]   6,675  
Investment, Identifier [Axis]: Symplr Software, Inc., Preferred stock 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 2,527    
Investments, at fair value, ending balance [1],[6],[24]   2,527  
Investment, Identifier [Axis]: Symplr Software, Inc., Preferred stock 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 1,478    
Investments, at fair value, ending balance [1],[6],[24]   1,478  
Investment, Identifier [Axis]: TI Intermediate Holdings, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[17] 3,668    
Investments, at fair value, ending balance 3,297 [2],[11],[16] 3,668 [1],[6],[15],[17]  
Investment, Identifier [Axis]: TI Intermediate Holdings, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 972    
Investments, at fair value, ending balance 875 [2],[11],[16] 972 [1],[6],[10],[15]  
Investment, Identifier [Axis]: TI Intermediate Holdings, LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 610    
Investments, at fair value, ending balance 547 [2],[11],[16] 610 [1],[6],[15]  
Investment, Identifier [Axis]: TI Intermediate Holdings, LLC, Senior secured 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 458    
Investments, at fair value, ending balance 418 [2],[11],[16] 458 [1],[6],[15]  
Investment, Identifier [Axis]: TI Intermediate Holdings, LLC, Senior secured 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 168    
Investments, at fair value, ending balance 151 [2],[11],[16] 168 [1],[6],[10],[15]  
Investment, Identifier [Axis]: TI Intermediate Holdings, LLC, Senior secured 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 31    
Investments, at fair value, ending balance 70 [2],[11],[16] 31 [1],[6],[15]  
Investment, Identifier [Axis]: TIDI Legacy Products, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 3,520    
Investments, at fair value, ending balance 3,485 [2],[11] 3,520 [1],[6],[10]  
Investment, Identifier [Axis]: TIDI Legacy Products, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: TIDI Legacy Products, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: TWAS Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10],[18],[19] 46,804    
Investments, at fair value, ending balance 46,323 [2],[11],[12] 46,804 [1],[10],[18],[19]  
Investment, Identifier [Axis]: TWAS Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[17],[18] 41,809    
Investments, at fair value, ending balance 41,374 [2],[11],[12] 41,809 [1],[6],[7],[17],[18]  
Investment, Identifier [Axis]: TWAS Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 10,854    
Investments, at fair value, ending balance 10,741 [2],[11],[12] 10,854 [1],[6],[10]  
Investment, Identifier [Axis]: TWAS Holdings, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 8,288    
Investments, at fair value, ending balance 8,203 [2],[11] 8,288 [1],[6],[10]  
Investment, Identifier [Axis]: TWAS Holdings, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,264    
Investments, at fair value, ending balance 5,210 [2],[11] 5,264 [1],[6],[10]  
Investment, Identifier [Axis]: TWAS Holdings, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Teaching Company, The, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 13,614    
Investments, at fair value, ending balance 12,290 [2],[11] 13,614 [1],[6]  
Investment, Identifier [Axis]: Teaching Company, The, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 50 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2,972    
Investments, at fair value, ending balance [1],[6]   2,972  
Investment, Identifier [Axis]: Tebra Technologies, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 17    
Investment, Identifier [Axis]: Tebra Technologies, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 4,942    
Investment, Identifier [Axis]: Tebra Technologies, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 11,261    
Investments, at fair value, ending balance 11,628 [2],[11],[16] 11,261 [1],[6],[15]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., One stop 10      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 88    
Investments, at fair value, ending balance 90 [2],[11],[16] 88 [1],[6],[15]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 10,962    
Investments, at fair value, ending balance 11,319 [2],[11],[16] 10,962 [1],[6],[15]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 7,222    
Investments, at fair value, ending balance 7,457 [2],[11],[16] 7,222 [1],[6],[15]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,857    
Investments, at fair value, ending balance 1,918 [2],[11],[16] 1,857 [1],[6],[15]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,651    
Investments, at fair value, ending balance 1,704 [2],[11],[16] 1,651 [1],[6],[15]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,238    
Investments, at fair value, ending balance 1,278 [2],[11],[16] 1,238 [1],[6],[15]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 1,031    
Investments, at fair value, ending balance 1,065 [2],[11],[16] 1,031 [1],[6],[15]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 825    
Investments, at fair value, ending balance 852 [2],[11],[16] 825 [1],[6],[15]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., One stop 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 164    
Investments, at fair value, ending balance 170 [2],[11],[16] 164 [1],[6],[15]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 11    
Investments, at fair value, ending balance 926 [2],[11] 11 [1],[6]  
Investment, Identifier [Axis]: Tebra Technologies, Inc., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Tebra Technologies, Inc., Warrant 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 547    
Investments, at fair value, ending balance [1],[6]   547  
Investment, Identifier [Axis]: Tebra Technologies, Inc., Warrant 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 56    
Investments, at fair value, ending balance [1],[6]   56  
Investment, Identifier [Axis]: Telesoft Holdings LLC, LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 123    
Investments, at fair value, ending balance 120 [2],[11] 123 [1],[6]  
Investment, Identifier [Axis]: Telesoft Holdings LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17],[18],[20] 21,186    
Investments, at fair value, ending balance 20,963 [2],[11],[12] 21,186 [1],[6],[17],[18],[20]  
Investment, Identifier [Axis]: Telesoft Holdings LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,432    
Investments, at fair value, ending balance 1,417 [2],[11] 1,432 [1],[6],[10]  
Investment, Identifier [Axis]: Telesoft Holdings LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 74    
Investments, at fair value, ending balance 37 [2],[11] 74 [1],[6]  
Investment, Identifier [Axis]: Templafy APS and Templafy, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[54] 4,800    
Investments, at fair value, ending balance 4,800 [2],[11],[26],[55] 4,800 [1],[6],[9],[10],[54]  
Investment, Identifier [Axis]: Templafy APS and Templafy, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[54] 0    
Investments, at fair value, ending balance 0 [2],[11],[26],[55] 0 [1],[6],[9],[54]  
Investment, Identifier [Axis]: Templafy APS and Templafy, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[55] 21    
Investment, Identifier [Axis]: Templafy APS and Templafy, LLC, Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[54] 96    
Investments, at fair value, ending balance [1],[6],[9],[54]   96  
Investment, Identifier [Axis]: Thermogenics, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26],[31] 139    
Investment, Identifier [Axis]: Thermogenics, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[25],[26] 0    
Investment, Identifier [Axis]: Thermogenics, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26] 180    
Investment, Identifier [Axis]: Thermogenics, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[25],[26] 0    
Investment, Identifier [Axis]: Thermogenics, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[25],[26],[31] 14    
Investment, Identifier [Axis]: Titan BW Borrower L.P, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 1,583    
Investment, Identifier [Axis]: Titan BW Borrower L.P., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (3)    
Investment, Identifier [Axis]: Titan BW Borrower L.P., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (1)    
Investment, Identifier [Axis]: Titan Fitness, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[10],[15],[19] 33,063    
Investments, at fair value, ending balance 31,974 [2],[11],[16] 33,063 [1],[6],[7],[10],[15],[19]  
Investment, Identifier [Axis]: Titan Fitness, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 2,398    
Investments, at fair value, ending balance 2,320 [2],[11],[16] 2,398 [1],[6],[15]  
Investment, Identifier [Axis]: Titan Fitness, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 300    
Investments, at fair value, ending balance 399 [2],[11],[16] 300 [1],[6],[15]  
Investment, Identifier [Axis]: Titan Fitness, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 621    
Investment, Identifier [Axis]: Togetherwork Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 27,973    
Investments, at fair value, ending balance 27,416 [2],[11],[12] 27,973 [1],[6],[18]  
Investment, Identifier [Axis]: Togetherwork Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 647 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Togetherwork Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance (24) [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Togetherwork Holdings, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,355    
Investments, at fair value, ending balance 1,376 [2],[11] 1,355 [1],[6]  
Investment, Identifier [Axis]: Transaction Data Systems, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[17],[19],[20] 75,488    
Investments, at fair value, ending balance 74,490 [2],[11],[12] 75,488 [1],[6],[7],[17],[19],[20]  
Investment, Identifier [Axis]: Transaction Data Systems, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Transform Bidco Limited, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[26],[30] 2,432    
Investment, Identifier [Axis]: Transform Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28] 5,337    
Investments, at fair value, ending balance 5,444 [2],[11],[26],[30] 5,337 [1],[6],[9],[10],[28]  
Investment, Identifier [Axis]: Transform Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[28] (2)    
Investments, at fair value, ending balance 4,339 [2],[11],[26],[30] (2) [1],[6],[9],[13],[28]  
Investment, Identifier [Axis]: Transform Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[28] (145)    
Investments, at fair value, ending balance 4,057 [2],[11],[16],[26],[30],[31] (145) [1],[6],[9],[13],[28]  
Investment, Identifier [Axis]: Transform Bidco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16],[26],[30],[31] 644    
Investment, Identifier [Axis]: Transform Bidco Limited, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[30] 0    
Investment, Identifier [Axis]: Transform Bidco Limited, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[30] 0    
Investment, Identifier [Axis]: Transform Bidco Limited, One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14],[26],[30] 0    
Investment, Identifier [Axis]: Tricentis Operations Holdings, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 7,741    
Investment, Identifier [Axis]: Tricentis Operations Holdings, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Tricentis Operations Holdings, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Tricentis Operations Holdings, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 44    
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,632    
Investments, at fair value, ending balance 2,625 [2],[11] 2,632 [1],[6],[10]  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 530    
Investments, at fair value, ending balance 528 [2],[11] 530 [1],[6]  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 494    
Investments, at fair value, ending balance 492 [2],[11] 494 [1],[6]  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 248    
Investment, Identifier [Axis]: Triple Lift, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 7,008    
Investments, at fair value, ending balance 6,718 [2],[11],[12] 7,008 [1],[6],[20]  
Investment, Identifier [Axis]: Triple Lift, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,495    
Investments, at fair value, ending balance 1,433 [2],[11],[12] 1,495 [1],[6],[10]  
Investment, Identifier [Axis]: Triple Lift, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 50    
Investments, at fair value, ending balance (10) [2],[11],[14] 50 [1],[6]  
Investment, Identifier [Axis]: Tronair Parent, Inc., Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 98    
Investment, Identifier [Axis]: Tronair Parent, Inc., LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 66    
Investments, at fair value, ending balance [1],[6]   66  
Investment, Identifier [Axis]: Ultimate Baked Goods Midco LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 9,314    
Investments, at fair value, ending balance [1],[6],[10]   9,314  
Investment, Identifier [Axis]: Ultimate Baked Goods Midco LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 48    
Investments, at fair value, ending balance [1],[6]   48  
Investment, Identifier [Axis]: Ultimate Baked Goods Midco LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,926    
Investments, at fair value, ending balance [1],[6]   1,926  
Investment, Identifier [Axis]: Unchained Labs, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,372    
Investments, at fair value, ending balance 1,357 [2],[11] 1,372 [1],[6]  
Investment, Identifier [Axis]: Unchained Labs, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,158    
Investments, at fair value, ending balance 1,147 [2],[11] 1,158 [1],[6],[10]  
Investment, Identifier [Axis]: Unchained Labs, LLC, Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (2)    
Investments, at fair value, ending balance (2) [2],[11],[14] (2) [1],[6],[13]  
Investment, Identifier [Axis]: VRS Buyer, Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,491    
Investment, Identifier [Axis]: VRS Buyer, Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: VRS Buyer, Inc., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: VSG Acquisition Corp. and Sherrill, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 92    
Investment, Identifier [Axis]: VSG Acquisition Corp. and Sherrill, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 47    
Investments, at fair value, ending balance [1],[6]   47  
Investment, Identifier [Axis]: VSG Acquisition Corp. and Sherrill, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 11,749    
Investments, at fair value, ending balance (1) [2],[11] 11,749 [1],[6],[18]  
Investment, Identifier [Axis]: VSG Acquisition Corp. and Sherrill, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,569    
Investments, at fair value, ending balance 130 [2],[11] 1,569 [1],[6]  
Investment, Identifier [Axis]: VSG Acquisition Corp. and Sherrill, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (6)    
Investments, at fair value, ending balance 16,183 [2],[11],[12] (6) [1],[6],[13]  
Investment, Identifier [Axis]: Vantage Bidco GMBH, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[15],[29],[46] 8,654    
Investments, at fair value, ending balance 9,226 [2],[11],[16],[26],[31],[47] 8,654 [1],[6],[9],[10],[15],[29],[46]  
Investment, Identifier [Axis]: Vantage Bidco GMBH, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[29],[46] (11)    
Investments, at fair value, ending balance 0 [2],[11],[14],[26],[31],[47] (11) [1],[6],[9],[13],[29],[46]  
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corporation, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15] 46,267    
Investments, at fair value, ending balance 52,117 [2],[11],[16],[25],[26] 46,267 [1],[6],[15]  
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corporation, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (93)    
Investments, at fair value, ending balance 0 [2],[11],[14],[25],[26] (93) [1],[6],[13]  
Investment, Identifier [Axis]: Varicent Intermediate Holdings Corporation, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (90)    
Investments, at fair value, ending balance 0 [2],[11],[14],[25],[26] (90) [1],[6],[13]  
Investment, Identifier [Axis]: Varinem German Midco GMBH, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[46] 7,299    
Investments, at fair value, ending balance 7,790 [2],[11],[26],[31],[47] 7,299 [1],[6],[9],[29],[46]  
Investment, Identifier [Axis]: Varinem German Midco GMBH, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[46] 0    
Investments, at fair value, ending balance 4,143 [2],[11],[26],[31],[47] 0 [1],[6],[9],[29],[46]  
Investment, Identifier [Axis]: Vector CS Midco Limited & Cloudsense Ltd., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[21],[28],[29] 7,004    
Investments, at fair value, ending balance [1],[6],[9],[15],[21],[28],[29]   7,004  
Investment, Identifier [Axis]: Vector CS Midco Limited & Cloudsense Ltd., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[15],[21],[28],[29] 138    
Investments, at fair value, ending balance [1],[6],[9],[15],[21],[28],[29]   138  
Investment, Identifier [Axis]: Vendavo, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[18],[19] 25,460    
Investments, at fair value, ending balance 24,385 [2],[11] 25,460 [1],[6],[7],[18],[19]  
Investment, Identifier [Axis]: Vendavo, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,129    
Investments, at fair value, ending balance 2,683 [2],[11] 1,129 [1],[6]  
Investment, Identifier [Axis]: Vendavo, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 928    
Investments, at fair value, ending balance 889 [2],[11] 928 [1],[6]  
Investment, Identifier [Axis]: Veranex, Inc., LP units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 16    
Investment, Identifier [Axis]: Veranex, Inc., LP units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Veranex, Inc., LP units 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 0    
Investment, Identifier [Axis]: Veranex, Inc., Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15],[21] 2,403    
Investments, at fair value, ending balance [1],[6],[10],[15],[21]   2,403  
Investment, Identifier [Axis]: Veranex, Inc., Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[21] 284    
Investments, at fair value, ending balance [1],[6],[15],[21]   284  
Investment, Identifier [Axis]: Veranex, Inc., Senior secured 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[21] 72    
Investments, at fair value, ending balance [1],[6],[15],[21]   72  
Investment, Identifier [Axis]: Vermont Aus Pty Ltd, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[44] 9,465    
Investments, at fair value, ending balance 8,958 [2],[11],[26],[31],[50] 9,465 [1],[6],[9],[29],[44]  
Investment, Identifier [Axis]: Vermont Aus Pty Ltd, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[29],[44] 10,081    
Investments, at fair value, ending balance 8,765 [2],[11],[26],[31],[50] 10,081 [1],[6],[9],[29],[44]  
Investment, Identifier [Axis]: Vessco Midco Holdings, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 22,275    
Investments, at fair value, ending balance 22,500 [2],[12] 22,275 [1],[6]  
Investment, Identifier [Axis]: Vessco Midco Holdings, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,025    
Investments, at fair value, ending balance 4,075 [2],[11] 1,025 [1],[6]  
Investment, Identifier [Axis]: Vessco Midco Holdings, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (25)    
Investments, at fair value, ending balance 0 [2],[11],[14] (25) [1],[6],[13]  
Investment, Identifier [Axis]: Viper Bidco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 37,985    
Investment, Identifier [Axis]: Viper Bidco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[31] 18,702    
Investment, Identifier [Axis]: Viper Bidco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Viper Bidco, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Viper Bidco, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] (5)    
Investment, Identifier [Axis]: Virginia Green Acquisition, LLC, LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 454    
Investments, at fair value, ending balance [1],[6]   454  
Investment, Identifier [Axis]: Virginia Green Acquisition, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,416    
Investments, at fair value, ending balance 3,165 [2],[11],[12] 2,416 [1],[6],[10]  
Investment, Identifier [Axis]: Virginia Green Acquisition, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: Virginia Green Acquisition, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 99    
Investments, at fair value, ending balance 0 [2],[11] 99 [1],[6]  
Investment, Identifier [Axis]: Virginia Green Acquisition, LLC, Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 454    
Investment, Identifier [Axis]: W3 Co, LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 928    
Investment, Identifier [Axis]: W3 Co., LLC interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,679    
Investments, at fair value, ending balance [1],[6]   1,679  
Investment, Identifier [Axis]: W3 Co., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 252    
Investments, at fair value, ending balance [1],[6]   252  
Investment, Identifier [Axis]: W3 Co.^, Common stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 224    
Investment, Identifier [Axis]: WBZ Investment, LLC, LLC interest 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 119    
Investments, at fair value, ending balance 116 [2],[11] 119 [1],[6]  
Investment, Identifier [Axis]: WBZ Investment, LLC, LLC interest 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 82    
Investments, at fair value, ending balance 65 [2],[11] 82 [1],[6]  
Investment, Identifier [Axis]: WBZ Investment, LLC, LLC interest 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 66    
Investments, at fair value, ending balance 58 [2],[11] 66 [1],[6]  
Investment, Identifier [Axis]: WBZ Investment, LLC, LLC interest 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 59    
Investments, at fair value, ending balance 24 [2],[11] 59 [1],[6]  
Investment, Identifier [Axis]: WBZ Investment, LLC, LLC interest 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 25    
Investments, at fair value, ending balance 2 [2],[11] 25 [1],[6]  
Investment, Identifier [Axis]: WBZ Investment, LLC, LLC interest 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 2    
Investments, at fair value, ending balance [1],[6]   2  
Investment, Identifier [Axis]: WBZ Investment, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 80    
Investment, Identifier [Axis]: WBZ Investment, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[18] 1,717    
Investments, at fair value, ending balance [1],[6],[15],[18]   1,717  
Investment, Identifier [Axis]: WBZ Investment, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[18],[19] 7,804    
Investments, at fair value, ending balance 7,703 [2],[11] 7,804 [1],[6],[15],[18],[19]  
Investment, Identifier [Axis]: WBZ Investment, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,702    
Investment, Identifier [Axis]: WBZ Investment, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[18] 1,194    
Investments, at fair value, ending balance 1,182 [2],[11] 1,194 [1],[6],[15],[18]  
Investment, Identifier [Axis]: WBZ Investment, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[18] 628    
Investments, at fair value, ending balance 628 [2],[11] 628 [1],[6],[15],[18]  
Investment, Identifier [Axis]: WBZ Investment, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: WPEngine, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 5,438    
Investments, at fair value, ending balance 5,438 [2],[11] 5,438 [1],[6],[10]  
Investment, Identifier [Axis]: WPEngine, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6]  
Investment, Identifier [Axis]: WRE Holding Corp., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 16,514    
Investments, at fair value, ending balance 16,349 [2],[12] 16,514 [1],[6]  
Investment, Identifier [Axis]: WRE Holding Corp., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 241    
Investments, at fair value, ending balance 294 [2],[11] 241 [1],[6]  
Investment, Identifier [Axis]: WRE Holding Corp., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: WRE Holding Corp., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[12] 1,795    
Investment, Identifier [Axis]: WRE Holding Corp., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[12] 1,081    
Investment, Identifier [Axis]: WRE Holding Corp., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 841    
Investment, Identifier [Axis]: WRE Holding Corp., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 301    
Investment, Identifier [Axis]: WRE Holding Corp., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 187    
Investment, Identifier [Axis]: WU Holdco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[17] 4,849    
Investments, at fair value, ending balance 9,564 [2],[11] 4,849 [1],[6],[17]  
Investment, Identifier [Axis]: WU Holdco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,713    
Investments, at fair value, ending balance 0 [2],[11],[14] 1,713 [1],[6],[10]  
Investment, Identifier [Axis]: WU Holdco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 446    
Investments, at fair value, ending balance 0 [2],[11],[14] 446 [1],[6]  
Investment, Identifier [Axis]: WU Holdco, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,567    
Investments, at fair value, ending balance [1],[6]   1,567  
Investment, Identifier [Axis]: WU Holdco, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 61    
Investments, at fair value, ending balance [1],[6]   61  
Investment, Identifier [Axis]: Wasabi Lower Holdco, LLC, Senior secured 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Wasabi Lower Holdco, LLC, Senior secured 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,610    
Investment, Identifier [Axis]: Watermill Express, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 3,072    
Investments, at fair value, ending balance [1],[6],[20]   3,072  
Investment, Identifier [Axis]: Watermill Express, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 297    
Investments, at fair value, ending balance [1],[6]   297  
Investment, Identifier [Axis]: Watermill Express, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 111    
Investments, at fair value, ending balance [1],[6]   111  
Investment, Identifier [Axis]: Watermill Express, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 742    
Investments, at fair value, ending balance [1],[6],[10]   742  
Investment, Identifier [Axis]: Watermill Express, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 371    
Investments, at fair value, ending balance [1],[6]   371  
Investment, Identifier [Axis]: Watermill Express, LLC, One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 564    
Investments, at fair value, ending balance [1],[6]   564  
Investment, Identifier [Axis]: Watermill Express, LLC., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 3,047    
Investment, Identifier [Axis]: Watermill Express, LLC., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 294    
Investment, Identifier [Axis]: Watermill Express, LLC., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 149    
Investment, Identifier [Axis]: Watermill Express, LLC., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 735    
Investment, Identifier [Axis]: Watermill Express, LLC., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 369    
Investment, Identifier [Axis]: Watermill Express, LLC., One stop 6      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[12] 2,381    
Investment, Identifier [Axis]: Watermill Express, LLC., One stop 7      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,771    
Investment, Identifier [Axis]: Watermill Express, LLC., One stop 8      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 3,956    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 2,853    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,307    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: WebPT, Inc., One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 903    
Investments, at fair value, ending balance 778 [2],[11] 903 [1],[6]  
Investment, Identifier [Axis]: Whitebridge Pet Brands, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[7],[18],[19] 26,358    
Investments, at fair value, ending balance [1],[6],[7],[18],[19]   26,358  
Investment, Identifier [Axis]: Whitebridge Pet Brands, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: Wildcat TopCo, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 23,302    
Investment, Identifier [Axis]: Wildcat TopCo, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 112    
Investment, Identifier [Axis]: Wildcat TopCo, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Winebow Holdings, Inc., One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[10],[17] 8,887    
Investments, at fair value, ending balance [1],[10],[17]   8,887  
Investment, Identifier [Axis]: Winebow Holdings, Inc., One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 8,123    
Investment, Identifier [Axis]: Wineshipping.com LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[18] 9,190    
Investments, at fair value, ending balance (205) [2],[11],[14] 9,190 [1],[6],[18]  
Investment, Identifier [Axis]: Wineshipping.com LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 251    
Investments, at fair value, ending balance 8,492 [2],[11],[16] 251 [1],[6]  
Investment, Identifier [Axis]: Wineshipping.com LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 138    
Investments, at fair value, ending balance 229 [2],[11],[16] 138 [1],[6]  
Investment, Identifier [Axis]: Wineshipping.com LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[16] 154    
Investment, Identifier [Axis]: Wizard Bidco Limited, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[28] 22,740    
Investments, at fair value, ending balance 22,740 [2],[11],[26],[30] 22,740 [1],[6],[9],[10],[28]  
Investment, Identifier [Axis]: Wizard Bidco Limited, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[10],[15],[28],[29] 10,483    
Investments, at fair value, ending balance 11,201 [2],[11],[16],[26],[30],[31] 10,483 [1],[6],[9],[10],[15],[28],[29]  
Investment, Identifier [Axis]: Wizard Bidco Limited, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 8,322    
Investments, at fair value, ending balance 8,366 [2],[11],[26],[30],[31] 8,322 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Wizard Bidco Limited, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[28],[29] 192    
Investments, at fair value, ending balance 174 [2],[11],[26],[30],[31] 192 [1],[6],[9],[28],[29]  
Investment, Identifier [Axis]: Wizard Bidco Limited, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[9],[13],[28],[29] 0    
Investments, at fair value, ending balance [1],[6],[9],[13],[28],[29]   0  
Investment, Identifier [Axis]: Workforce Software, LLC, Common stock 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[24] 1,524    
Investments, at fair value, ending balance [1],[6],[24]   1,524  
Investment, Identifier [Axis]: Workforce Software, LLC, Common stock 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 48    
Investments, at fair value, ending balance [1],[6]   48  
Investment, Identifier [Axis]: Workforce Software, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[20] 41,999    
Investments, at fair value, ending balance [1],[6],[15],[20]   41,999  
Investment, Identifier [Axis]: Workforce Software, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[15],[20] 7,436    
Investments, at fair value, ending balance [1],[6],[15],[20]   7,436  
Investment, Identifier [Axis]: Workforce Software, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 5,266    
Investments, at fair value, ending balance [1],[6],[10],[15]   5,266  
Investment, Identifier [Axis]: Workforce Software, LLC, One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[15] 1,580    
Investments, at fair value, ending balance [1],[6],[10],[15]   1,580  
Investment, Identifier [Axis]: Workforce Software, LLC, One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: World Insurance Associates, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 1,724    
Investment, Identifier [Axis]: World Insurance Associates, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: YE Brands Holding, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10],[17] 17,632    
Investments, at fair value, ending balance 17,454 [2],[11],[12] 17,632 [1],[6],[10],[17]  
Investment, Identifier [Axis]: YE Brands Holding, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 933    
Investments, at fair value, ending balance 1,179 [2],[11] 933 [1],[6]  
Investment, Identifier [Axis]: YE Brands Holding, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 54    
Investments, at fair value, ending balance 24 [2],[11] 54 [1],[6]  
Investment, Identifier [Axis]: YI, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 4,430    
Investments, at fair value, ending balance 4,342 [2],[11] 4,430 [1],[6],[10]  
Investment, Identifier [Axis]: YI, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance (2) [2],[11],[14] 0 [1],[6],[13]  
Investment, Identifier [Axis]: YI, LLC, One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance [1],[6],[13]   0  
Investment, Identifier [Axis]: Yorkshire Parent, Inc., LP interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 626    
Investment, Identifier [Axis]: Yorkshire Parent, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 577    
Investments, at fair value, ending balance [1],[6]   577  
Investment, Identifier [Axis]: Yorkshire Parent, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 2,634    
Investments, at fair value, ending balance 2,227 [2],[11] 2,634 [1],[6],[10]  
Investment, Identifier [Axis]: Yorkshire Parent, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 71 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Yorkshire Parent, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 2,203 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Yorkshire Parent, Inc., One stop 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 610    
Investment, Identifier [Axis]: Yorkshire Parent, Inc., One stop 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 62    
Investment, Identifier [Axis]: Zarya Holdco, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 1,385    
Investments, at fair value, ending balance 7,174 [2],[11] 1,385 [1],[6],[10]  
Investment, Identifier [Axis]: Zarya Holdco, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 7,102    
Investments, at fair value, ending balance 1,399 [2],[11] 7,102 [1],[6],[10]  
Investment, Identifier [Axis]: Zarya Holdco, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] (2)    
Investments, at fair value, ending balance 0 [2],[11] (2) [1],[6],[13]  
Investment, Identifier [Axis]: Zendesk, Inc., LP units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 602    
Investments, at fair value, ending balance 648 [2],[11] 602 [1],[6]  
Investment, Identifier [Axis]: Zendesk, Inc., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[20] 28,647    
Investments, at fair value, ending balance 28,368 [2],[11] 28,647 [1],[6],[20]  
Investment, Identifier [Axis]: Zendesk, Inc., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 2,179 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Zendesk, Inc., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[13] 0    
Investments, at fair value, ending balance 0 [2],[11] 0 [1],[6],[13]  
Investment, Identifier [Axis]: Zullas, L.C., One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 24    
Investment, Identifier [Axis]: Zullas, L.C., One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 439    
Investment, Identifier [Axis]: Zullas, L.C., One stop 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[14] 0    
Investment, Identifier [Axis]: Zullas, L.C., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 250    
Investment, Identifier [Axis]: bswift, LLC, One stop      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6],[10] 7,817    
Investments, at fair value, ending balance [1],[6],[10]   7,817  
Investment, Identifier [Axis]: bswift, LLC, One stop 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11],[12] 7,604    
Investment, Identifier [Axis]: bswift, LLC, One stop 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, ending balance [2],[11] 9,950    
Investment, Identifier [Axis]: mParticle, Inc., Preferred stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] 1,120    
Investments, at fair value, ending balance [1],[6]   1,120  
Investment, Identifier [Axis]: mParticle, Inc., Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investments, at fair value, beginning balance [1],[6] $ 382    
Investments, at fair value, ending balance [1],[6]   $ 382  
Fair Value | Asset Concentration Risk | Non-qualifying Asset      
Concentration risk, percentage 13.30% 13.30%  
[1] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. See Note 6. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.
[2] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. See Note 6. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.
[3] As defined in the 1940 Act, the Company is deemed to be an “affiliated person” of the portfolio company as the Company owns five percent or more of the portfolio company's voting securities (“non-controlled affiliate”). Transactions related to investments in non-controlled affiliates for the year ended September 30, 2024 were as follows:
Portfolio CompanyFair value as of September 30, 2023
Gross additions(a)
Gross reductions(b)
Net change in unrealized appreciation (depreciation)Net realized gain (loss)Fair value as of September 30, 2024Interest, dividend and fee income
Abita Brewing Co. LLC$6,536 $2,166 $(709)$(1,993)$— $6,000 $575 
Bayside Opco, LLC22,044 2,758 (699)5,024 — 29,127 3,660 
Benetech, Inc.1,353 780 (843)503 — 1,793 
Elite Dental Partners LLC13,396 5,845 (3,013)(4,532)— 11,696 180 
Imperial Optical Midco Inc.— 94,556 — (692)— 93,864 1,008 
Opening Day Borrower 111 LLC24,438 27,853 (23,040)(4,272)(43)24,936 629 
Rubio's Restaurants, Inc.12,063 3,759 (3,929)6,624 (18,517)— 1,187 
SPF Borrower LLC— 34,008 (136)2,781 — 36,653 2,112 
Switchfly LLC7,254 6,180 (5,378)1,157 (1,900)7,313 88 
Total Non-Controlled Affiliates$87,084 $177,905 $(37,747)$4,600 $(20,460)$211,382 $9,448 
(a)
Gross additions could include increases in the cost basis of investments resulting from new investments, amounts related to PIK interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement of an existing portfolio company into this affiliated category from a different category.
(b)
Gross reductions could include decreases in the cost basis of investments resulting from principal collections related to investment repayments and sales, the amortization of premiums, the reversal of capitalized PIK for non-accrual positions and the exchange of one or more existing securities for one or more new securities.
[4] As defined in the 1940 Act, the Company is deemed to be both an “affiliated person” of and “control” this portfolio company as the Company owns more than 25% of the portfolio company's outstanding voting securities or has the power to exercise control over management or policies of such portfolio company (including through a management agreement) (“controlled affiliate”). Transactions related to investments in controlled affiliates for the year ended September 30, 2024 were as follows:
Portfolio CompanyFair value as of September 30, 2023
Gross additions(a)
Gross reductions(b)
Net change in unrealized appreciation (depreciation)Net realized gain (loss)Fair value as of September 30, 2024Interest, dividend and fee income
MMan Acquisition Co.$12,790 $11,979 $(11,344)$10,406 $(11,626)$12,205 $439 
Total Controlled Affiliates$12,790 $11,979 $(11,344)$10,406 $(11,626)$12,205 $439 
(a)
Gross additions could include increases in the cost basis of investments resulting from new investments, amounts related to PIK interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement of an existing portfolio company into this affiliated category from a different category.
(b)
Gross reductions could include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the amortization of premiums, the reversal of capitalized PIK for non-accrual positions and the exchange of one or more existing securities for one or more new securities.
[5] As defined in the 1940 Act, the Company is deemed to be both an “affiliated person” of and “control” this portfolio company as the Company owns more than 25% of the portfolio company's outstanding voting securities or has the power to exercise control over management or policies of such portfolio company (including through a management agreement) (“controlled affiliate”). Transactions related to investments in controlled affiliates for the year ended September 30, 2025 were as follows:
Portfolio CompanyFair value as of September 30, 2024
Gross additions(a)
Gross reductions(b)
Net change in unrealized appreciation (depreciation)Net realized gain (loss)Fair value as of September 30, 2025Interest, dividend and fee income
MMan Acquisition Co.$12,205 $490 $— $(833)$— $11,862 $510 
Total Controlled Affiliates$12,205 $490 $— $(833)$— $11,862 $510 
(a)
Gross additions could include increases in the cost basis of investments resulting from new investments, amounts related to PIK interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement of an existing portfolio company into this affiliated category from a different category.
(b)
Gross reductions could include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the amortization of premiums, the reversal of capitalized PIK for non-accrual positions and the exchange of one or more existing securities for one or more new securities.
[6]
Denotes that all or a portion of the investment collateralizes the JPM Credit Facility (as defined in Note 7).
[7]
Denotes that all or a portion of the loan collateralizes the notes offered in the 2018 Debt Securitization (as defined in Note 7).
[8] The headquarters of this portfolio company is located in Canada.
[9] The investment is treated as a non-qualifying asset under Section 55(a) of the Investment Company Act of 1940, as amended (the “1940 Act”). Under the 1940 Act, the Company cannot acquire any non-qualifying asset unless, at the time the acquisition is made, qualifying assets represent at least 70% of the Company's total assets. As of September 30, 2024, total non-qualifying assets at fair value represented 13.3% of the Company's total assets calculated in accordance with the 1940 Act.
[10]
Denotes that all or a portion of the loan collateralizes the GBDC 3 DB Credit Facility (as defined in Note 7).
[11]
Denotes that all or a portion of the investment collateralizes the JPM Credit Facility (as defined in Note 7).
[12]
Denotes that all or a portion of the loan collateralizes the notes offered in the 2024 Debt Securitization (as defined in Note 7).
[13] The negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par. The negative amortized cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan.
[14] The negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par. The negative amortized cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan.
[15] All or a portion of the loan interest was capitalized into the outstanding principal balance of the loan in accordance with the terms of the credit agreement during the year ended September 30, 2024.
[16] All or a portion of the loan interest was capitalized into the outstanding principal balance of the loan in accordance with the terms of the credit agreement during the year ended September 30, 2025.
[17]
Denotes that all or a portion of the loan collateralizes the notes offered in the GBDC 3 2021 Debt Securitization (as defined in Note 7).
[18]
Denotes that all or a portion of the loan collateralizes the notes offered in the GBDC 3 2022-2 Debt Securitization (as defined in Note 7).
[19]
Denotes that all or a portion of the loan collateralizes the notes offered in the GCIC 2018 Debt Securitization (as defined in Note 7).
[20]
Denotes that all or a portion of the loan collateralizes the notes offered in the GBDC 3 2022 Debt Securitization (as defined in Note 7).
[21] Loan was on non-accrual status as of September 30, 2024, meaning that the Company has ceased recognizing interest income on the loan.
[22] Investment was on non-accrual status as of September 30, 2025, meaning that the Company has ceased recognizing interest or non-cash dividend income on the investment.
[23] As defined in the 1940 Act, the Company is deemed to be an “affiliated person” of the portfolio company as the Company owns five percent or more of the portfolio company's voting securities (“non-controlled affiliate”). Transactions related to investments in non-controlled affiliates for the year ended September 30, 2025 were as follows:
Portfolio CompanyFair value as of September 30, 2024
Gross additions(a)
Gross reductions(b)
Net change in unrealized appreciation (depreciation)Net realized gain (loss)Fair value as of September 30, 2025Interest, dividend and fee income
Abita Brewing Co. LLC$6,000 $11,690 $(9,725)$(2,749)$— $5,216 $114 
Bayside Opco, LLC29,127 1,165 (156)3,850 — 33,986 3,263 
Benetech, Inc.1,793 — (189)485 — 2,089 
Chestnut Optical Midco, Inc.(c)
93,864 3,717 — 4,371 — 101,952 3,440 
Elite Dental Partners LLC11,696 1,145 — (2,149)— 10,692 223 
Fleet Farm Group LLC— 32,523 — 720 — 33,243 416 
G & H Wire Company, Inc.— 6,657 — (587)— 6,070 251 
IMPLUS Footcare, LLC23,769 — — 23,769 238 
Opening Day Borrower 111 LLC24,936 12,900 (8,225)(6,375)— 23,236 303 
Reaction Biology Corporation— 10,426 (1,684)(1,483)— 7,259 182 
SPF Borrower LLC36,653 620 (328)524 — 37,469 2,994 
Switchfly LLC7,313 2,547 (1,427)349 — 8,782 26 
Total Non-Controlled Affiliates$211,382 $107,159 $(21,734)$(3,044)$— $293,763 $11,458 
(a)
Gross additions could include increases in the cost basis of investments resulting from new investments, amounts related to PIK interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement of an existing portfolio company into this affiliated category from a different category.
(b)
Gross reductions could include decreases in the cost basis of investments resulting from principal collections related to investment repayments and sales, the amortization of premiums, the reversal of capitalized PIK for non-accrual positions and the exchange of one or more existing securities for one or more new securities.
(c)
Formerly known as Imperial Optical Midco Inc.
[24] The Company holds an equity investment that is income producing.
[25] The headquarters of this portfolio company is located in Canada.
[26] The investment is treated as a non-qualifying asset under Section 55(a) of the Investment Company Act of 1940, as amended (the “1940 Act”). Under the 1940 Act, the Company cannot acquire any non-qualifying asset unless, at the time the acquisition is made, qualifying assets represent at least 70% of the Company's total assets. As of September 30, 2025, total non-qualifying assets at fair value represented 13.3% of the Company's total assets calculated in accordance with the 1940 Act.
[27] The Company holds an equity investment that is income producing.
[28] The headquarters of this portfolio company is located in the United Kingdom.
[29] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date or the date of the transaction. See Note 2.
[30] The headquarters of this portfolio company is located in the United Kingdom.
[31] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date or the date of the transaction. See Note 2.
[32] Equity investments are non-income producing securities unless otherwise noted.
[33] Ownership of certain equity investments occurs through a holding company or partnership
[34] The headquarters of this portfolio company is located in Netherlands.
[35] The headquarters of this portfolio company is located in Netherlands.
[36] The headquarters of this portfolio company is located in Luxembourg.
[37] The headquarters of this portfolio company is located in France.
[38] The headquarters of this portfolio company is located in France.
[39] The fair value of the loan reflects the legal claim on par and accrued uncapitalized payment-in-kind (“PIK”) interest.
[40] The fair value of the loan reflects the legal claim on par and accrued uncapitalized payment-in-kind (“PIK”) interest.
[41] The headquarters of this portfolio company is located in Luxembourg.
[42] The headquarters of this portfolio company is located in Israel.
[43] The headquarters of this portfolio company is located in Israel.
[44] The headquarters of this portfolio company is located in Australia.
[45] The fair value of this investment was valued using Level 1 inputs. See Note 6.
[46] The headquarters of this portfolio company is located in Germany.
[47] The headquarters of this portfolio company is located in Germany.
[48] The headquarters of this portfolio company is located in Sweden.
[49] The headquarters of this portfolio company is located in Sweden.
[50] The headquarters of this portfolio company is located in Australia.
[51] The headquarters of this portfolio company is located in Jersey.
[52] The headquarters of this portfolio company is located in Finland.
[53] The headquarters of this portfolio company is located in Finland.
[54] The headquarters of this portfolio company is located in Denmark.
[55] The headquarters of this portfolio company is located in Denmark.